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104-436: Richard "Dick" Fisher graduated from Harvard University in 1936. He ran a company building small, lightweight boats out of balsa wood . He designed a rowboat and got the materials to build it, but he never completed it. In the 1950s, polyurethane foam, a stiff, lightweight, buoyant material, was invented. Fisher imagined it as a replacement for the lightweight balsa used in small boat construction, and in 1954 he constructed

208-534: A SEAL team, they would undergo a SEAL Basic Indoctrination (SBI) training class at Camp Kerry in the Cuyamaca Mountains . After SBI training class, they would enter a platoon and conduct platoon training. According to founding SEAL team member Roy Boehm , the SEALs' first missions were directed against communist Cuba . These consisted of deploying from submarines and carrying out beach reconnaissance in

312-518: A coarse, open grain . The density of dry balsa wood ranges from 40 to 475 kg/m , with a typical density around 160 kg/m . Balsa is the softest wood ever measured using the Janka hardness test (22 to 167 lbf ). The wood of the living tree has large cells that are filled with water. This gives the wood a spongy texture. It also makes the wood of the living tree not much lighter than water and barely able to float . For commercial production,

416-530: A combined strength of 300 men. During the "Forgotten War" the UDTs fought intensely, employing demolition expertise gained from World War II and using it for an offensive role. Continuing to use water as cover and concealment as well as an insertion method, the Korean Era UDTs targeted bridges, tunnels, fishing nets, and other maritime and coastal targets. They also developed a close working relationship with

520-615: A complement of seven officers and 45 enlisted men each. However, the UDTs were the only special troops that avoided complete disbandment after the war, unlike the OSS Maritime Unit, the VAC Recon Battalion, and several Marine recon missions. Because they were so integral to the success of missions in the Pacific during the war, the U.S. Navy did not publicize the existence of the UDTs until post-war. During WWII

624-411: A coordinate location, the SEALs operated close to their targets. Into the late 1960s, the SEALs were successful in a new style of warfare, effective in anti-guerrilla and guerrilla actions. SEALs brought a personal war to the enemy in a previously safe area. The VC referred to them as "the men with green faces," due to the camouflage face paint the SEALs wore during combat missions. In February 1966,

728-702: A fleet of hired Greek wooden fishing vessels—called caiques—covertly supported OSS agents in Albania, Greece, and Yugoslavia. After Italy surrendered, the MU and Mariassalto , an elite Italian special operations naval unit, operated against the Germans. In the Far East, the MU operated in conjunction with an Operational Group to attack Japanese forces on the Arakan coast of Burma. They jointly conducted reconnaissance missions on

832-530: A floating 13-foot (4.0 m) Whaler with a crosscut saw halfway through the hull. After the cut was completed, Fisher used the stern section to tow the bow section back to shore. Modern Whaler advertising uses a chain saw . Due to the foam core construction, the Whaler will remain afloat when sawed completely in half. Boston Whaler boats also remain afloat when completely swamped (full of water). Because of these attributes, Boston Whaler's trademarked sales line

936-478: A high degree of proficiency in unconventional warfare (UW), direct action (DA), and special reconnaissance (SR), among other tasks like sabotage, demolition, intelligence gathering, and hydrographic reconnaissance, training, and advising friendly militaries or other forces. All active SEALs are members of the U.S. Navy. Although not formally founded until 1962, the modern-day U.S. Navy SEALs trace their roots to World War II . The United States Military recognized

1040-466: A medical student offering the use of his technology to the secretive organization in 1942. In 1944 he was commissioned as an Army officer and later joined the OSS as an operational swimmer. Lambertsen himself led the OSS Maritime Unit on covert underwater missions to attach explosives to Japanese ships. Dr. Christian Lambertsen is remembered today as the 'Father of Military Underwater Operations'. Along with all

1144-416: A prelude to a proposed US amphibious invasion of the island. On at least one occasion, Boehm and another SEAL had smuggled a CIA agent ashore to take pictures of Soviet nuclear missiles being unloaded on the dockside. The Pacific Command recognized Vietnam as a potential hot spot for unconventional forces. At the beginning of 1962, the UDTs started hydrographic surveys and along with other branches of

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1248-420: A silver star and all the enlisted received bronze stars with Vs for Operation Forager (Tinian). For UDTs 3 and 4 every officer received a silver star and all the enlisted received bronze stars with Vs for Operation Forager (Guam). Admiral Richard Lansing Conolly felt the commanders of teams 3 and 4 (LT Crist and LT W.G. Carberry) should have received Navy Crosses. As the first to often make amphibious landings,

1352-399: A slight V bottom and the two runners on the sides. Fisher then approached Hunt to examine the design changes. Hunt added his own design changes to the prototype; most notably, a third runner in the center of the hull. Fisher then built a prototype based on this new design to serve as a plug for the production mold. Fisher and Hunt then took the boat on sea trials. One of these tests was to run

1456-792: A small SEAL Team One detachment arrived in South Vietnam to conduct direct action missions. Operating from Nhà Bè Base , near the Rung Sat Special Zone, this detachment signalled the beginning of a SEAL presence that would eventually include 8 SEAL platoons in country on a continuing basis. SEALs also served as advisors for Provincial Reconnaissance Units and the Lein Doc Nguio Nhia, the Vietnamese SEALs. SEALs continued to make forays into North Vietnam and Laos and covertly into Cambodia , controlled by

1560-608: A small sailing dinghy filled with the foam, with a design similar to the Sunfish . He showed the finished product to his friend, naval architect C. Raymond Hunt . Hunt recognized potential in the process, however he did not feel the design was particularly suited to sailboats. Instead, he created a design based on the Hickman Sea Sled featuring a cathedral hull . Fisher built a prototype out of Styrofoam and Epoxy. "It had two keels," said Fisher, "one inverted V between

1664-560: A swimmer to remain underwater for several hours and to approach targets undetected because the LARU did not emit telltale air bubbles. The LARU was later refined, adapted, and the technology used by the U.S. Army, U.S. Navy, and NASA. The Army Special Forces Underwater Operations School at Key West, Florida, the home of Special Forces maritime operations, draws its roots from the Maritime Unit. Lambertsen began his involvement with OSS as

1768-521: Is "the unsinkable legend." Today, this "unsinkable" attribute is not exclusive to Boston Whalers. All motorboats (and certain other boat types) under 20 feet (6.1 m), manufactured for sale in the United States are required by law to have positive flotation, such that a completely swamped boat will still float. This is accomplished through the use of closed cell foam, or other non-permeable material. Boston Whaler, however, does claim to exceed

1872-404: Is a pioneer plant , which establishes itself in clearings in forests, either man-made or where trees have fallen, or in abandoned agricultural fields. It grows extremely rapidly, up to 27 metres (89 ft) in 10–15 years. The speed of growth accounts for the lightness of the wood, which has a lower density than cork . Trees generally do not live beyond 30 to 40 years. Flowers are produced from

1976-411: Is also used in laminates together with glass-reinforced plastic ( fiberglass ) for making high-quality balsa surfboards and for the decks and topsides of many types of boats , especially pleasure craft less than 30 m in length. On a boat, the balsa core is usually end-grain balsa, which is much more resistant to compression than if the soft balsa wood were laid lengthwise. More than 90% of

2080-542: Is also valued as a component of full-sized light wooden aeroplanes , most notably the World War II de Havilland Mosquito . Balsa is used to make wooden crankbaits for fishing, especially Rapala lures. Sticks of dried balsa are useful as makeshift pens for calligraphy when commercial metal nibs of the desired width are not available. Balsa wood is often selected as a core material in composites . Because O. pyramidale grows quickly and tolerates poor soils it

2184-665: Is famous for its wide usage in woodworking , due to its softness and its high strength compared to its low density. The name balsa is the Spanish word for "raft." A deciduous angiosperm , Ochroma pyramidale can grow up to 30 m tall, and is classified as a hardwood despite the wood itself being very soft; it is the softest commercial hardwood and is widely used because of its light weight. Balsa trees grow extremely fast, often up to 27 metres in 10–15 years, and do not usually live beyond 30 to 40 years. They are often cultivated in dense patches, with Ecuador supplying 95% or more of

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2288-433: Is low in density but high in specific strength (strength per weight), balsa is a very popular material for light, stiff structures in model bridge tests , model buildings, and construction of model aircraft ; all grades are usable for airworthy control line and radio-controlled aircraft varieties of the aeromodeling sports, with the lightest "contest grades" especially valuable for free-flight model aircraft . However, it

2392-435: Is lower in cost per performance compared to polymer foams like EPS while having better tensile strength than typical foams. For example, the blades of wind turbines are commonly constructed of many balsa plywood cores and internal spars covered with resin infused cloth on both sides. In table tennis rackets, a balsa layer is typically sandwiched between two pieces of thin plywood made from other species of wood. Balsa wood

2496-604: The Caroline Islands during August 1944. Three of the men failed to make the rendezvous point for extraction. They were reported captured in Japanese communications and identified as "BAKUHATAI" – explosive ordnance men. They were never seen again and are listed as MIAs . The first units designated as Underwater Demolition Teams were formed in the Pacific Theater . Rear Admiral Kelly Turner ,

2600-662: The Chevrolet Corvette had floor pans composed of balsa sandwiched between sheets of carbon-fiber-reinforced plastic . Norwegian scientist and adventurer Thor Heyerdahl , convinced that early contact between the peoples of South America and Polynesia was possible, built the raft Kon Tiki from balsa logs, and upon it his crew and he sailed the Pacific Ocean from Peru to the Polynesian Tuamotu Archipelago in 1947. However,

2704-473: The Kon Tiki logs were not seasoned and owed much of their (rather slight) buoyancy to the fact that their sap was of lower density than sea water. This serendipitously may have saved the expedition, because it prevented the seawater from waterlogging the wood and sinking the raft. Balsa wood is also a popular wood type used in the arts of whittling , and surfing . In the making of picture frames, balsa

2808-632: The Pacific Theater. Thirty NCDUs had been sent to the Pacific prior to Normandy. NCDUs 1–10 were staged on Florida Island in the Solomon Islands (archipelago) during January 1944. NCDU 1 went briefly to the Aleutians in 1943. NCDUs 4 and 5 were the first to see combat by helping the 4th Marines at Green Island and Emirau Island . A few were temporarily attached to UDTs. Later NCDUs 1–10 were combined to form Underwater Demolition Team Able. Six NCDUs: 2,3, 19, 20, 21 and 24 served with

2912-695: The Republic of Korea Underwater Demolitions Unit (predecessor to the Navy Special Warfare Flotilla) , which continues today. Through their focused efforts on demolitions and mine disposal, the UDTs refined and developed their commando tactics during the Korean War. The UDTs also accompanied South Korean commandos on raids in the North to demolish train tunnels. This was frowned upon by higher-ranking officials because they believed it

3016-587: The Studies and Observations Group . The SEALs from Team Two started a unique deployment of SEAL team members working alone with ARVN Commandos. In 1967, a SEAL unit named Detachment Bravo (Det Bravo) was formed to operate these mixed US and ARVN units. By 1970, President Richard Nixon initiated a plan of Vietnamization , which would remove the US from the Vietnam War and return the responsibility of defense back to

3120-531: The U.S. Navy 's primary special operations force and a component of the Naval Special Warfare Command . Among the SEALs' main functions are conducting small-unit special operation missions in maritime, jungle, urban, arctic, mountainous, and desert environments. SEALs are typically ordered to capture or kill high-level targets, or to gather intelligence behind enemy lines. SEAL team personnel are hand-selected, highly trained, and possess

3224-622: The United States Coast Guard in rescue and river patrol missions. Current production models range in length from 11.3 to 42.5 feet (3.4 to 13.0 meters). Brunswick also owns Mercury Marine ; as a result, new Boston Whalers, like all other Brunswick boats, ship from the factory already equipped with Mercury engines. Models include: Boston Whaler has, for many years, sawn boats in half to illustrate their durability, performance, smooth ride and "unsinkability". The original 1961 Life magazine ad pictured Dick Fisher sitting in

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3328-431: The kinkajou and the olingo , may be the primary pollinators. It is evergreen or dry-season deciduous , with large 30 to 40 centimetres (12 to 16 in), weakly palmately lobed leaves. Being a deciduous angiosperm , balsa is classified as a hardwood despite the wood itself being very soft; it is the softest commercial hardwood. Ecuador supplies 70% or more of commercial balsa. In recent years, about 60% of

3432-404: The 13-foot (4.0 m) boat from Cohasset, Massachusetts to New Bedford and back, which is roughly 120 miles (190 km). During these sea trials, Fisher found another small flaw in the boats design: it was "wetter than hell." "A lot wetter," he said, "than the other boat had been." The reason for this, according to him, was the 9-inch-wide (23 cm) sole throwing spray into the boat. Since

3536-776: The CIA. Army Special Forces, founded in 1952 by former members of the OSS, established the first military special operations combat diver units nearly a decade before the SEALs were created in 1962. Some of the earliest World War II predecessors of the Green Berets and SEALs were the Operational Swimmers of OSS. The OSS Maritime Unit executed special operations, dropping operatives behind enemy lines to engage in organized guerrilla warfare as well as to gather information on such things as enemy resources and troop movements. British Combined Operations veteran LCDR Wooley, of

3640-536: The Coast Guard requirements. Designs Other Balsa wood Bombax pyramidale Cav. ex Lam. Ochroma bicolor Rowlee Ochroma concolor Rowlee Ochroma lagopus Sw. Ochroma obtusum Rowlee Ochroma pyramidale , commonly known as the balsa tree , is a large, fast-growing tree native to the Americas. It is the sole member of the genus Ochroma . The tree

3744-510: The German defenses. The NCDUs suffered 31 killed and 60 wounded, a casualty rate of 52%. Meanwhile, the NCDUs at Utah Beach met less intense enemy fire. They cleared 700 yards (640 metres) of beach in two hours, another 900 yards (820 metres) by the afternoon. Casualties at Utah Beach were significantly lighter with six killed and eleven wounded. During Operation Overlord, not a single demolitioneer

3848-513: The Governor's mansion, the SEALs realized they had forgotten to load their cryptographic satellite phone . As Grenadian and Cuban troops surrounded the team, the SEALs' only radio ran out of battery power, and they used the mansion's land line telephone to call in AC-130 gunship fire support. The SEALs were pinned down in the mansion overnight and were relieved and extracted by a group of Marines

3952-807: The Japanese-held coast, sometimes penetrating several miles up enemy-controlled rivers. The MU developed or used several innovative devices that would later allow for the creation of a special operations combat-diver capability, first in Army Special Forces (Green Berets) and later in US Navy SEAL units. Perhaps the most important invention in the realm of special operations diving was the Lambertsen Amphibious Respiratory Unit (LARU) invented by Dr. Christian J. Lambertsen . The Lambertsen unit permitted

4056-573: The Korean coast. The UDTs specialized in a somewhat new mission: Night coastal demolition raids against railroad tunnels and bridges. The UDT men were given the task because, in the words of UDT LT Ted Fielding, "We were ready to do what nobody else could do, and what nobody else wanted to do." (Ted Fielding was awarded the Silver Star during Korea, and was later promoted to the rank of Captain.) On 15 September 1950, UDTs supported Operation Chromite,

4160-503: The Kuwaiti Navy in exile. Using these new diving, swimming, and combat skills, these commandos took part in combat operations such as the liberation of the capital city. The United States Navy contributed extensive special operations assets to Panama's invasion, codenamed Operation Just Cause . This included SEAL Teams 2 and 4, Naval Special Warfare Unit 8, and Special Boat Unit 26, all falling under Naval Special Warfare Group 2; and

4264-677: The NCDUs. However, at Kwajalein Fort Pierce protocol was changed. Admiral Turner ordered daylight reconnaissance and CEC. ENS Lewis F. Luehrs and Seabee Chief William Acheson wore swim trunks under their fatigues anticipating they would not be able to get what the Admiral wanted by staying in the boat. They stripped down and spent 45 minutes in the water in broad daylight. When they got out they were taken directly to Admiral Turner's flagship to report, still in their trunks. Admiral Turner concluded that daylight reconnaissance by individual swimmers

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4368-734: The NCDUs. UDT training was at the Waipio Amphibious Operating Base, under V Amphibious Corps operational and administrative control. Most of the instructors and trainees were graduates of the Fort Pierce NCDU or Scouts and Raiders schools, Seabees, Marines, and Army soldiers. When Teams 1 and 2 were initially formed, they were "provisional" with 180 men in total. The first underwater demolition team commanders were CDR E.D. Brewster (CEC) UDT 1 and CDR John T. Koehler UDT 2. The teams wore fatigues with life-vests and were not expected to leave their boats—similar to

4472-537: The Navy SEALs. His announcement was actually only a formal acknowledgement of a process that had been underway since the Korean War. The Navy needed to determine its role within the special operations arena. In March 1961, Admiral Arleigh Burke , the Chief of Naval Operations , recommended the establishment of guerrilla and counter-guerrilla units. These units would be able to operate from sea, air or land. This

4576-614: The Navy did not have a rating for the UDTs nor did they have an insignia. Those men with the CB rating on their uniforms considered themselves Seabees that were doing underwater demolition (Fig. 11). They did not call themselves "UDTs" or " Frogmen " but rather "Demolitioneers" which had carried over from the NCDUs and Lt Cdr Kauffman's recruiting efforts from the Seabee dynamiting and demolition school. The next largest group of UDT volunteers came from

4680-479: The Navy's top amphibious expert, ordered the formation of Underwater Demolition Teams in response to the failed invasion at Tarawa and the Marines' inability to clear the surrounding coral reefs with Landing Vehicle Tracked (LVTS). Turner recognized that amphibious operations required intelligence of underwater obstacles. The personnel for these teams were mostly local Seabees or others that had started out in

4784-713: The North Africa campaign the following November. Operation Torch was launched in November 1942 off the Atlantic coast of French Morocco in North Africa. The first group included Phil H. Bucklew , the "Father of Naval Special Warfare," after whom the Naval Special Warfare Center building is named. Commissioned in October 1942, this group saw combat in November 1942 during Operation Torch on

4888-691: The North African Coast. Scouts and Raiders also supported landings in Sicily , Salerno , Anzio , Normandy , and southern France . The second group of Scouts and Raiders, code-named Special Service Unit No. 1 , was established on 7 July 1943, as a joint and combined operations force. The first mission, in September 1943, was at Finschhafen in Papua New Guinea . Later operations were at Gasmata , Arawe , Cape Gloucester , and

4992-623: The Royal Navy, was placed in charge of the OSS Maritime Unit (MU) in June 1943. Their training started in November 1943 at Camp Pendleton , California, moved to Santa Catalina Island , California in January 1944, and finally moved to the warmer waters of The Bahamas in March 1944. Within the U.S. military, they pioneered flexible swimfins and diving masks , closed-circuit diving equipment (under

5096-422: The SEALs mission was to conduct counter guerilla warfare and clandestine operations in maritime and riverine environments. Men of the newly formed SEAL Teams were trained in such unconventional areas as hand-to-hand combat , high-altitude parachuting , demolitions , and foreign languages. The SEALs attended Underwater Demolition Team replacement training and they spent some time training in UDTs. Upon making it to

5200-530: The Scout and Raider school at Fort Pierce, Florida . They formed the core of what was envisioned as a "guerrilla amphibious organization of Americans and Chinese operating from coastal waters, lakes, and rivers employing small steamboats and sampans." While most Amphibious Raider forces remained at Camp Knox in Calcutta, three of the groups saw active service. They conducted a survey of the upper Yangtze River in

5304-699: The Scouts and Raiders method of nighttime rubber boats. In order to implement these changes and grow the UDTs, Koehler was made the commanding officer of the Naval Combat Demolition Training and Experimental Base on Maui. Admiral Turner also brought on LCDR Draper Kauffman as a combat officer. Seabees made up the vast majority of the men in teams 1–9, 13, and 15. Seabees were roughly 20% of UDT 11. The officers were mostly CEC. At war's end 34 teams had been formed with teams 1–21 having actually been deployed. The Seabees provided over half of

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5408-608: The Seventh Amphibious Force and were the only remaining NCDUs at the end of the war. The Naval Special Warfare Command building is named for LTJG Frank Kaine CEC commander of NCDU 2. Much like their brethren in the US Army Special Forces (aka Green Berets), the Navy SEALs claim a lineage to the Office of Strategic Services (OSS) . The OSS was a paramilitary organization and also a progenitor of

5512-682: The South Vietnamese in combat diving, demolitions and guerrilla/anti-guerrilla tactics. As the war continued, the SEALs found themselves positioned in the Rung Sat Special Zone where they were to disrupt the enemy supply and troop movements and in the Mekong Delta to fulfill riverine operations, fighting on the inland waterways. Combat with the VC was direct. Unlike the conventional warfare methods of firing artillery into

5616-469: The South Vietnamese. Conventional forces were being withdrawn; the last SEAL platoon left South Vietnam on 7 December 1971, and the last SEAL advisor left South Vietnam in March 1973. The SEALs were among the most highly decorated units for their size in the war, receiving by 1974 one Medal of Honor , two Navy Crosses , 42 Silver stars , 402 Bronze Stars , two Legions of Merit , 352 Commendation Medals, and 51 Navy Achievement Medals Later awards would bring

5720-544: The UDT's were considered an indispensable US military special operations unit, and Navy planners in the Central Pacific relied heavily on the UDT's reconnaissance reports and demolition activities to clear the way for landings. The last UDT operation of the war was on 4 July 1945 at Balikpapan , Borneo . The rapid demobilization at the conclusion of the war reduced the number of active duty UDTs to two on each coast with

5824-555: The UDTs began making signs to welcome the Marines, indicating they had been there first, to foster the continued friendly rivalry. In keeping with UDT tradition, UDT 21 created a sign to greet the Marines landing in Japan. For Operation Beleaguer UDT 9 was deployed with the III Amphibious Corps to Northern China. In 1965 the UDT 12 put up another beach sign to greet the Marines at Da Nang . Operation Crossroads UDT 3

5928-799: The US Military, the Military Assistance Command Vietnam (MACV) was formed. In March 1962, SEALs were deployed to South Vietnam as advisors for the purpose of training Army of the Republic of Vietnam commandos in the same methods they were trained themselves. The Central Intelligence Agency began using SEALs in covert operations in early 1963. The SEALs were later involved in the CIA sponsored Phoenix Program where it targeted Vietcong (VC) infrastructure and personnel for capture and assassination. The SEALs were initially deployed in and around Da Nang , training

6032-492: The Vietnam War. In 1974–1975, UDT-13 was redesignated; some personnel established Underwater Construction Teams , and while others joined special boat detachments. On 1 May 1983, UDT–11 was redesignated as SEAL Team Five, UDT–21 was redesignated as SEAL Team Four, UDT–12 became SEAL Delivery Vehicle Team One (SDVT–1) , and UDT–22 was redesignated as SDVT-2 . SEAL Team Three, was established 1 October 1983 in Coronado, California. United States Special Operations Command (SOCOM)

6136-406: The Wadi Sebou River during Operation Torch in North Africa. This enabled USS  Dallas  (DD-199) to traverse the water and insert U.S. Rangers who captured the Port Lyautey airdrome. In early May 1943, a two-phase "Naval Demolition Project" was directed by the Chief of Naval Operations "to meet a present and urgent requirement". The first phase began at ATB Solomons, Maryland with

6240-426: The Whaler was so light in weight compared to the other boats at the time, it could be propelled by lower horsepower engines. Thru the late 1980s, the classic 13 ft 4 in (4.06 m) Whaler, and the 16 ft 7 in (5.05 m) Montauk were the most popular models in terms of sales. Gradually though the company moved away from these designs to a more conventional deep-vee hull, and after 1996 no more of

6344-541: The amphibious landing at Incheon. UDT 1 and 3 provided personnel who went in ahead of the landing craft, scouting mud flats, marking low points in the channel, clearing fouled propellers, and searching for mines. Four UDT personnel acted as wave-guides for the Marine landing. In October 1950, UDTs supported mine-clearing operations in Wonsan Harbor where frogmen would locate and mark mines for minesweepers. On 12 October 1950, two U.S. minesweepers hit mines and sank. UDTs rescued 25 sailors. The next day, William Giannotti conducted

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6448-423: The balsa has been plantation -grown in densely packed patches of around 1000 trees per hectare (compared to about two to three per hectare in nature). The trees are harvested after six to ten years of growth in Ecuador. The remaining volume of balsa is harvested from plantations in Papua New Guinea; the climate is different, therefore harvesting occurs at 4-5 years of age. Balsa lumber is very soft and light, with

6552-424: The classic tri-hull boats were manufactured. In 1969 the Boston Whaler boat operation of Fisher-Pierce was sold to the CML Group, whose portfolio would eventually include brands such as NordicTrack and The Nature Company . In 1989, amidst financial problems, the CML Group sold Boston Whaler to the Reebok Corporation , where, despite several advertising campaigns and new hull designs, it did relatively poorly, and

6656-523: The commercial balsa. The wood from these trees is highly valuable due to its high strength-to-weight ratio, which is achieved through a kiln-drying process that leaves the wood's cells hollow and empty. Balsa wood is popular for light, stiff structures in model bridge tests, model buildings, and construction of model aircraft. It is also used in the manufacturing of wooden crankbaits for fishing, makeshift pens for calligraphy, composites, surfboards, boats, "breakaway" props for theatre and television, and even in

6760-410: The direction of Dr. Christian J. Lambertsen ), the use of Swimmer Delivery Vehicles (a type of submersible), and combat swimming and limpet mine attacks. The OSS MU mission was "to infiltrate agents and supply resistance groups by sea, conduct maritime sabotage, and develop specialized maritime surface and subsurface equipment and devices." The MU operated in several theaters. In the Mediterranean,

6864-428: The east and south coasts of New Britain , all without any loss of personnel. Conflicts arose over operational matters, and all non-Navy personnel were reassigned. The unit, renamed 7th Amphibious Scouts, received a new mission, to go ashore with the assault boats, buoy channels, erect markers for the incoming craft, handle casualties, take offshore soundings, clear beach obstacles, and maintain voice communications linking

6968-414: The establishment of Operational Naval Demolition Unit No. 1. Six officers and eighteen enlisted men reported from the Seabee 's NTC Camp Peary dynamiting and demolition school, for a four-week course. Those Seabees, led by Lieutenant Fred Wise CEC, were immediately sent to participate in the invasion of Sicily. At that time Lieutenant Commander Draper L. Kauffman , "The Father of Naval Combat Demolition,"

7072-431: The first U.S. combat operation using an "aqualung" when he dived on USS  Pledge . For the remainder of the war, UDTs conducted beach and river reconnaissance, infiltrated guerrillas behind the lines from sea, continued mine sweeping operations and participated in Operation Fishnet, which devastated the North Koreans' fishing capability. President John F. Kennedy , aware of the situation in Southeast Asia, recognized

7176-506: The floor pans of the Chevrolet Corvette . Balsa wood played a historical role in Thor Heyerdahl's Kon-Tiki expedition where it was used to build the raft. Balsa wood is also popular in arts such as whittling, and in the making of baroque-style picture frames due to its ease of shaping. A member of the mallow family, Ochroma pyramidale is native from southern Mexico to southern Brazil, but can now be found in many other countries (Papua New Guinea, Indonesia, Thailand, Solomon Islands). It

7280-403: The following morning. The team sent to the radio station also ran into communication problems. As soon as the SEALs reached the radio facility they found themselves unable to raise their command post. After beating back several waves of Grenadian and Cuban troops supported by BTR-60 armored personnel carriers, the SEALs decided that their position at the radio tower was untenable. They destroyed

7384-488: The joint Army-Navy Scouts and Raiders school that was also in Fort Pierce and the Navy's bomb disposal school in the Seabee-dominated teams. For the Marianas operations of Kwajalein, Roi-Namur , Siapan, Tinian, Eniwetok , and Guam, Admiral Turner recommended sixty Silver Stars and over three hundred Bronze Stars with Vs for the Seabees and other service members of UDTs 1–7 That was unprecedented in U.S. Naval/Marine Corps history. For UDTs 5 and 7 every officer received

7488-401: The landing beach. The unit was led by U.S. Army 1st Lieutenant Lloyd Peddicord as commanding officer, and Navy Ensign John Bell as executive officer. Navy Chief Petty Officers and sailors came from the boat pool at U. S. Naval Amphibious Training Base, Solomons, Maryland , and Army Raider personnel came from the 3rd and 9th Infantry Divisions . They trained at Little Creek until embarking for

7592-649: The members of the OSS Maritime Unit, he was made honorary Green Berets and recognized by organizations like the UDT Navy Seal Association for their heroic and critical work. In May 1944, Colonel "Wild Bill" Donovan , the head of the OSS, divided the Maritime Unit into four groups and approached General MacArthur and Admiral Nimitz about using OSS men in the Pacific Gen. MacArthur had no interest at all. Adm Nimitz looked at Donovan's list of units and also said no thank you except he could use

7696-649: The men in the teams that saw service. The UDT uniform had transitioned from the combat fatigues of the NCDUs to trunks, swimfins , diving masks and Ka-bars . The men trained by the OSS had brought their swimfins with them when they joined the UDTs. They were adopted by the other teams as quickly as Supply could get them. These "Naked Warriors", as they came to be called post-war, saw action in every major Pacific amphibious landing including: Eniwetok , Saipan , Kwajalein , Tinian , Guam , Angaur , Ulithi , Peleliu , Leyte , Lingayen Gulf , Zambales , Iwo Jima , Okinawa , Labuan , and Brunei Bay . By fall of 1944,

7800-545: The mold was already made, it was modified by adding to the flat center between the three chines, turning it into a V-shape. In 1956, this design became the original Boston Whaler 13. In 1958, boats made by the Fisher-Pierce manufacturing company were first marketed and sold under the brand name Boston Whaler. The boat was very stable and had great carrying capacity. These two features, along with great performance and rough weather handling made it very desirable. Also since

7904-414: The name "Hell Week" by NCDU recruits, this rigorous course was integrated into UDT training and remains a part of modern-day Navy Seal training today. By April 1944, a total of 34 NCDUs were deployed to England in preparation for Operation Overlord , the amphibious landing at Normandy . On 6 June 1944, under heavy fire, the NCDUs at Omaha Beach managed to blow eight complete gaps and two partial gaps in

8008-657: The need for unconventional warfare and special operations as a measure against guerrilla warfare . In a speech to Congress on 25 May 1961, Kennedy spoke of his deep respect for the United States Army Special Forces . While his announcement of the government's plan to put a man on the moon drew most of the attention, in the same speech he announced his intention to spend over $ 100 million to strengthen U.S. special operations forces and expand American capabilities in unconventional warfare. Some people erroneously credit President Kennedy with creating

8112-476: The need for a beach reconnaissance force, a select group of Army and Navy personnel assembled at Amphibious Training Base (ATB) Little Creek , Virginia on 15 August 1942 to begin Amphibious Scouts and Raiders (Joint) training. The Scouts and Raiders' mission was to identify and reconnoiter the objective beach, maintain a position on the designated beach prior to a landing, and guide the assault waves to

8216-483: The need for the covert reconnaissance of landing beaches and coastal defenses . As a result, the joint Army, Marine Corps, and Navy Amphibious Scout and Raider School was established in 1942 at Fort Pierce, Florida . The Scouts and Raiders were formed in September of that year, just nine months after the attack on Pearl Harbor , from the Observer Group , a joint U.S. Army-Marine-Navy unit. Recognizing

8320-589: The operations in the Marshall Islands , Admiral Turner restructured the two provisional UDT units and created 7 permanent units with an allotted size of 96 men per team. In the name of operational efficiency, the UDTs were also made an-all Navy outfit, and any Army and Marine corp engineers were returned to their units. Moving forward, the UDTs would employ the reconnaissance method made successful in Kwajalein – daytime use of swimsuits and goggles instead of

8424-486: The original designer of the wooden Sea Sled for a solution. However, Hickman thought his design needed no modifications. Fisher contemplated putting "some stuff on the bottom to move that airy water out of there." He used a method of trial and error, laying fiberglass on the bottom of the hull in the morning and running the boat behind his house when the glass cured. If the design did not work, he would bring it back to his house and start over. This prototype boat began to have

8528-420: The runners and an anti-skid, anti-trip chine." Fisher tested the boat all that summer and thought it was “the greatest thing ever”. That fall, Fisher started running the boat in rough weather, and found that the hull displayed issues with handling and cavitation . Under heavy load, and off-plane, the cavity in the middle of the hull forced air into the water, and then back into the prop. Fisher approached Hickman,

8632-613: The separate Naval Special Warfare Development Group (DEVGRU). DEVGRU fell under Task Force Blue, while Naval Special Warfare Group 2 composed the entirety of Task Force White. Task Force White was tasked with three principal objectives: the destruction of Panamanian Defense Forces (PDF) naval assets in Balboa Harbor and the destruction of Manuel Noriega 's private jet at Paitilla Airport (collectively known as Operation Nifty Package ), as well as isolating PDF forces on Flamenco Island. The strike on Balboa Harbor by Task Unit Whiskey

8736-502: The spring of 1945 and, disguised as coolies , conducted a detailed three-month survey of the Chinese coast from Shanghai to Kitchioh Wan, near Hong Kong . In September 1942, 17 Navy salvage personnel arrived at ATB Little Creek, Virginia for a week-long course in demolitions, explosive cable cutting, and commando raiding techniques. On 10 November 1942, the first combat demolition unit successfully cut cable and net barriers across

8840-664: The station and fought their way to the water where they hid from patrolling enemy forces. After the enemy had given up their search, the SEALs, some wounded, swam into the open sea where they were extracted several hours later after being spotted by a reconnaissance aircraft. During the closing stages of the Iran–Iraq War the United States Navy began conducting operations in the Persian Gulf to protect US-flagged ships from attack by Iranian naval forces. A secret plan

8944-489: The swimmers from the Maritime Unit to expand the UDTs. He was primarily interested in them for being swimmers, not their military training. The interest in the tactical applications of the OSS Operational Swimmers ' training only developed later but most of Group A's gear was put into storage as it was not applicable to UDT work. The OSS was very restricted in operations in the Pacific. ADM Nimitz approved

9048-748: The takedown of the Iran Ajr . Evidence gathered on the Iran Ajr by the SEALs later allowed the US Navy to trace the mines that struck USS  Samuel B. Roberts  (FFG-58) . This chain of events led to Operation Praying Mantis , the largest US Naval surface engagement since the Second World War. During Operation Desert Shield and Storm, Navy SEALs trained Kuwaiti Special Forces. They set up naval special operations groups in Kuwait, working with

9152-457: The third year onwards, typically at the end of the rainy season when few other trees are in flower. The large flowers open in the late afternoon and remain open overnight. Each may contain a pool of nectar up to 2.5 centimetres (0.98 in) deep. Daytime pollinators include capuchin monkeys . However, most pollination occurs at night. The main pollinators were once thought to be bats, but recent evidence suggests that two nocturnal arboreal mammals,

9256-553: The total to three Medals of Honor and five Navy Crosses. SEAL Team One was awarded three Presidential Unit Citations and one Navy Unit Commendation; SEAL Team Two received two Presidential Unit Citations. By the end of the war, 48 SEALs had been killed in Vietnam, but estimates of their kill count are as high as 2,000. The Navy SEAL Museum in Fort Pierce, Florida, displays a list of the 48 SEALs who lost their lives in combat during

9360-535: The transfer the five officers and 24 enlisted men of Maritime Unit Operational Swimmer Group A led by Lieutenant Choate. They became part of UDT 10 in July 1944. LT Choate would become commander of UDT 10. The rest of MU Group A would fill most of UDT 10's command offices as well as many of the swimmers. Five of the OSS-trained men participated in the very first UDT submarine operation with USS  Burrfish in

9464-643: The troops ashore, incoming boats and nearby ships. The 7th Amphibious Scouts conducted operations in the Pacific for the duration of the conflict, participating in more than 40 landings. The third and final Scouts and Raiders organization operated in China. Scouts and Raiders were deployed to fight with the Sino-American Cooperative Organization (SACO) . To help bolster the work of SACO, Admiral Ernest J. King ordered that 120 officers and 900 men be trained for "Amphibious Raider" at

9568-461: The wood is kiln-dried for about two weeks, leaving the cells hollow and empty. The large volume-to-surface ratio of the resulting thin-walled, empty cells gives the dried wood a large strength-to-weight ratio because the cells are mostly air. Unlike naturally rotted wood, which soon disintegrates in the rainforests where balsa trees grow, the cell walls of kiln- seasoned balsa wood retain their strong structure of cellulose and lignin . Because it

9672-468: The world's Balsa wood volume is prepared into end grain panels for the composites industry, mostly used as structural cores in the wind turbine blades. Where strength, rigidity, durable and environmentally sustainable materials are sought after. Balsa is also used in the manufacture of "breakaway" wooden props such as tables and chairs that are designed to be broken as part of theatre, movie, and television productions. The fifth and sixth generations of

9776-552: Was a non-traditional use of Naval forces. Due to the nature of the war, the UDTs maintained a low operational profile. Some of the missions included transporting spies into North Korea and the destruction of North Korean fishing nets used to supply the North Korean Army. As part of the Special Operations Group, or SOG, UDTs successfully conducted demolition raids on railroad tunnels and bridges along

9880-542: Was designated TU 1.1.3 for the operation. On 27 April 1946, seven officers and 51 enlisted embarked at CBC Port Hueneme, for transit to Bikini. Their assignment was to retrieve water samples from ground zero of the Baker blast. The Korean War began on 25 June 1950, when the North Korean army invaded South Korea . Beginning with a detachment of 11 personnel from UDT 3, UDT participation expanded to three teams with

9984-502: Was established in April 1987 and its Naval component, United States Naval Special Warfare Command (NAVSPECWARCOM), also known as NSWC, was established at the same time. Both SEAL Team Four and SEAL Team Six, the predecessor to DEVGRU , participated in the US invasion of Grenada. The SEALs' two primary missions were the extraction of Grenada's Governor-General, Sir Paul Scoon , and the capture of Grenada's only radio tower. Neither mission

10088-648: Was lost to improper handling of explosives. In August 1944, four NCDUs from Utah Beach plus nine others participated in the landings Operation Dragoon in southern France. It was the last amphibious operation in the European Theater of Operations . Once the European invasions were complete, Rear Admiral Kelly Turner requisitioned all available NCDUs from Fort Pierce for integration into the Underwater Demolition Teams (UDTs) operating in

10192-462: Was often used in a baroque style because of the ease of shaping the design. In parts of Africa and south America the leaves of the balsa tree are used to enhance the traditional panning method of extracting gold from ore. When mixed with water a soapy solution is produced and this helps the lighter, unwanted material to wash away. Navy SEALs The United States Navy Sea, Air, and Land ( SEAL ) Teams , commonly known as Navy SEALs , are

10296-496: Was put in place and dubbed Operation Prime Chance . Navy SEAL Teams 1 and 2 along with several Special Boat Units and EOD technicians were deployed on mobile command barges and transported by helicopters from the Army's 160th Special Operations Aviation Regiment . Over the course of the operation SEALs conducted VBSS ( visit, board, search, and seizure ) missions to counter Iranian mine-laying boats. The only loss of life occurred during

10400-474: Was selected to set up a school for Naval Demolitions and direct the entire Project. The first six classes graduated from "Area E" at NTC Camp Peary. LCDR Kauffman's needs quickly out-grew "Area E" and on 6 June 1943, he established NCDU training at Fort Pierce. Most of Kauffman's volunteers came from the navy's Civil Engineer Corps (CEC) and enlisted Seabees. Training commenced with a grueling week designed to filter out under-performing candidates. Eventually given

10504-520: Was sold to Meridian Sports in 1994. Two years later in 1996 Brunswick Corporation purchased Boston Whaler for $ 27.4 million in cash and debt. While Boston Whalers are primarily seen as recreational boats, Brunswick Boats maintains a commercial division that sells Boston Whalers to coast guard and naval units worldwide. Boston Whalers were used in the Vietnam War by both the Navy SEALs and

10608-805: Was the beginning of the Navy SEALs. All SEALs came from the Navy's Underwater Demolition Teams , who had already gained extensive experience in commando warfare in Korea ; however, the Underwater Demolition Teams were still necessary to the Navy's amphibious force. The first two teams were formed in January 1962 and stationed on both US coasts: Team One at Naval Amphibious Base Coronado , in San Diego, California and Team Two at Naval Amphibious Base Little Creek , in Virginia Beach, Virginia . Formed entirely with personnel from UDTs,

10712-452: Was the way to get accurate information on coral and underwater obstacles for upcoming landings. This is what he reported to Admiral Nimitz. The success of those UDT 1 Seabees not following Fort Pierce protocol rewrote the UDT mission model and training regimen. Those Seabees also created the image of UDTs as the "naked warriors". At Engebi CDR Brewster was wounded and all of the men with ENS Luehrs wore swim trunks under their greens. After

10816-627: Was well briefed or sufficiently supported with timely intelligence and the SEALs ran into trouble from the very beginning. On 24 October 1983, twelve operators from SEAL Team Six and four Air Force Combat Control Team members (CCT) conducted a predawn combat airborne water insertion from C-130 Hercules aircraft with Zodiac inflatable rubber boats 40 kilometers north of Point Salines, Grenada. The team inserted with full combat gear in bad weather with low visibility conditions and high winds. Four SEALs drowned and were never recovered. SEALs split into two teams and proceeded to their objectives. After digging in at

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