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68-694: The Arlington Heights Army Air Defense Site was a Project Nike Missile Master site near Chicago , Illinois. It operated from 1960 until 1968. Installation started in late 1959 after the United States Army had purchased 44 acres (18 ha). Adjacent to the Arlington Heights Air Force Station, the Arlington Heights Army Installation opened on October 28, 1960, as the 8th of 10 Army Air Defense Command Posts (AADCP) to have

136-643: A Martin AN/FSG-1 Antiaircraft Defense System installed for Nike-Hercules command and control. In addition to the Army's 2 AN/FPS-6 radars, the radars of the co-located USAF station provided AADCP data for the 45th Artillery Brigade's control of the Chicago-Gary Defense Area (10 missile batteries and their Integrated Fire Control sites). [1] The vacuum tube AN/FSG-1 was replaced c.  October 1967 with

204-455: A flight transponder is an automated transceiver in an aircraft that emits a coded identifying signal in response to an interrogating received signal. In a communications satellite , a satellite transponder receives signals over a range of uplink frequencies, usually from a satellite ground station ; the transponder amplifies them, and re-transmits them on a different set of downlink frequencies to receivers on Earth, often without changing

272-721: A Defense Area formed a circle around these cities and bases. There was no fixed number of Nike batteries in a Defense Area and the actual number of batteries varied from a low of two in the Barksdale AFB Defense Area to a high of 22 in the Chicago Defense Area. In the Continental United States the sites were numbered from 01 to 99 starting at the north and increasing clockwise. The numbers had no relation to actual compass headings, but generally Nike sites numbered 01 to 25 were to

340-560: A battery in Leonardo, New Jersey on 22 May 1958, killing six soldiers and four civilians. A memorial can be found at Fort Hancock in the Sandy Hook Unit of Gateway National Recreation Area . Even as Nike Ajax was being tested, work started on Nike-B, later renamed Nike Hercules (MIM-14). It improved speed, range and accuracy, and could intercept ballistic missiles . The Hercules had a range of about 100 miles (160 km),

408-427: A central missile assembly point from which missiles would be taken out to prepared above-ground launch racks ringing the defended area. However, the Army discarded this semimobile concept because the system needed to be ready for instantaneous action to fend off a "surprise attack." Instead, a fixed-site scheme was devised. Due to geographical factors, the placement of Nike batteries differed at each location. Initially,

476-574: A few remain intact and preserve the history of the Nike project. There are also a few sites abroad, notably in Germany, Turkey and Greece. Defense areas within the United States were: The Nike boosters were also used as stages in sounding rockets as they became surplus starting in the 1950s in the following versions: Transponder In air navigation or radio frequency identification ,

544-414: A lap they swipe or touch the receiver which is connected to a computer and log their lap time. NASCAR uses transponders and cable loops placed at numerous points around the track to determine the lineup during a caution period. This system replaced a dangerous race back to the start-finish line . Many modern automobiles have keys with transponders hidden inside the plastic head of the key. The user of

612-466: A more appropriate name when the system was put into production. This never came to pass; the original Nike-X concept was replaced by a much more limited defense system known as the Sentinel program that used some of the same equipment. Nike-X was a response to the failure of the earlier Nike Zeus system. Zeus had been designed to face a few dozen Soviet ICBMs in the 1950s, and its design would mean it

680-816: A number of studies carried out between 1965 and 1967 examined a variety of scenarios where a limited number of interceptors might still be militarily useful. Among these, the I-67 concept suggested building a lightweight defense against very limited attacks. When the Chinese exploded their first H-bomb in 1967, I-67 was promoted as a defense against a Chinese attack, and this system became Sentinel in October. Nike-X development, in its original form, ended. The figures do not include approximately 1 billion dollars for research and development, paid to Western Electric. Total cost to Army: 1,545.1 Soviet development of ICBMs decreased

748-412: A range of 25 miles (40 km). The missile contained an unusual three part payload , with explosive fragmentation charges at three points down the length of the missile to help ensure a lethal hit. The missile's limited range was seen by critics as a serious flaw, because it often meant that the missile had to be situated very close to the area it was protecting. Consolidated Western Steel produced

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816-520: A result, differences in transponder functionality also might influence the functional description of related optical modules like transceivers and muxponders . Another type of transponder occurs in identification friend or foe (IFF) systems in military aviation and in air traffic control secondary surveillance radar (beacon radar) systems for general aviation and commercial aviation . Primary radar works best with large all-metal aircraft, but not so well on small, composite aircraft. Its range

884-418: A ship's radar screen. Sonar transponders operate under water and are used to measure distance and form the basis of underwater location marking, position tracking and navigation . Electronic toll collection systems such as E-ZPass in the eastern United States use RFID transponders to identify vehicles. Transponders are used in races for lap timing. A cable loop is dug into the race circuit near to

952-533: A single plug on the warhead from the "Safe Plug" to "Surface to Air" or "Surface to Surface" and a range setting in the TRR. The Nike Hercules was deployed starting in June 1958. First deployed to Chicago , 393 Hercules ground systems were manufactured. By 1960 ARADCOM had 88 Hercules batteries and 174 Ajax batteries, defending 23 zones across 30 states. Peak deployment was in 1963 with 134 Hercules batteries not including

1020-690: A solid-state Hughes AN/TSQ-51 Air Defense Command and Coordination System , which controlled the combined Chicago-Milwaukee Defense Area after the Milwaukee Defense Area merged with Chicago-Gary in 1968. Project Concise ended the site's Nike operations in 1974, and 52 acres (21 ha) were transferred to the city parks district. A May 1979 golf course was built near the nuclear bunker—the Arlington Lakes Golf Club has 90 acres (36 ha) with 14 lakes. Project Nike Project Nike (Greek: Νίκη , "Victory")

1088-450: A supersonic rocket is no longer fast enough to be simply aimed at the target. The missile must "lead" the target to ensure the target is hit before the missile depletes its fuel. This means that the missile and target cannot be tracked by a single radar, increasing the complexity of the system. By this point, the US had considerable experience with lead-calculating analog computers , starting with

1156-485: A top speed in excess of 3,000 mph (4,800 km/h) and a maximum altitude of around 150,000 ft (30 km). It had solid fuel boost and sustainer rocket motors. The boost phase was four of the Nike Ajax boosters strapped together. In the 70's some (foreign)users replaced vacuum tube guidance circuits in the missile with more reliable solid-state components but electron tube circuits were still used well into

1224-447: A very fast, short-range missile known as Sprint . Large numbers would be clustered near potential targets, allowing successful interception right up to the last few seconds of the warhead's re-entry. They would operate below the altitude where decoys or explosions had any effect. Nike-X also used a new radar system that could track hundreds of objects at once, allowing salvoes of many Sprints. It would require dozens of missiles to overwhelm

1292-405: Is also limited by terrain and rain or snow and also detects unwanted objects such as automobiles, hills and trees. Furthermore, it cannot always estimate the altitude of an aircraft. Secondary radar overcomes these limitations but it depends on a transponder in the aircraft to respond to interrogations from the ground station to make the plane more visible. Depending on the type of interrogation,

1360-412: Is mandatory in controlled airspace in many countries. Some countries have also required, or are moving toward requiring, that all aircraft be equipped with Mode S, even in uncontrolled airspace . However, in the field of general aviation there have been objections to these moves, because of the cost, size, limited benefit to the users in uncontrolled airspace, and, in the case of balloons and gliders ,

1428-507: The Anti-Ballistic Missile Treaty signed during 1972, and further budget reduction, almost all Nike sites in the continental United States were deactivated by April 1974. Some units remained active until the later part of that decade in a coastal air defense role. These trucks and trailers were used with the Nike system. By 1958, the Army deployed nearly 200 Nike Ajax batteries at 40 "Defense Areas" within

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1496-732: The Homestead AFB /Miami Defense Area, those starting with NY were in the New York Defense Area, and so forth. As an example Nike Site SF-88L refers to the launcher area (L) of the battery located in the northwestern part (88) of the San Francisco Defense Area (SF). During the early-to-mid-1960s the Nike Ajax batteries were upgraded to the Hercules system. The new missiles had greater range and destructive power, so about half as many batteries provided

1564-423: The 80's. The electron tube's resistance to EMP effects over earlier non EMP hardened solid state circuits played a major part in the retention of 'obsolete' technology until hardened circuits were developed. The missile also had an optional nuclear warhead to improve the ability to defend against mass formations. The W-31 warhead had four variants offering 2, 10, 20 and 30 kiloton yields. The 20 kt version

1632-728: The British Kerrison Predictor and a series of increasingly capable U.S. designs. For Nike, three radars were used. The acquisition radar (such as the AN/GSS-1 Electronic Search Central with the AN/TPS-1D radar) searched for a target to be handed over to the Target Tracking Radar (TTR) for tracking. The Missile Tracking Radar (MTR) tracked the missile by way of a transponder , as the missile's radar signature alone

1700-465: The Launch Area, depending upon site configuration, obstructions, and the availability of land. The Launch Area provided for the maintenance, storage, testing, and firing of the Nike missiles. The selection of this area was primarily influenced by the relatively large amount of land required, its suitability to extensive underground construction, and the need to maintain a clear line-of-sight between

1768-497: The US Army Hercules batteries deployed in Germany, Greece, Greenland, Italy, Korea, Okinawa, Taiwan, and Turkey. In 1961, SAC and the U.S. Army began a joint training mission with benefits for both parties. SAC needed fresh (simulated) targets which the cities ringed by Nike/Hercules sites provided, and the Army needed live targets to acquire and track with their radar. SAC had many Radar Bomb Scoring (RBS) sites across

1836-504: The US. As a last-line of defense from air attack, they were positioned to protect cities as well as military installations. The missile was deployed first at Fort Meade, Maryland during December 1953. A further 240 launch sites were built up to 1962. They replaced 896 radar-guided anti-aircraft guns , operated by the National Guard or Army to protect certain key sites. This left a handful of 75 mm Skysweeper emplacements as

1904-662: The United States (including Alaska and Hawaii) in which Project Nike missiles were deployed. Within each Defense Area, a "Ring of Steel" was developed with a series of Nike Integrated Firing and Launch Sites constructed by the Corps of Engineers. The deployment was designed to initially supplement and then replace gun batteries deployed around the nation's major urban areas and vital military installations. The defense areas consisted of major cities and selected United States Air Force Strategic Air Command bases which were deemed vital to national defense. The original basing strategy projected

1972-598: The aircrews. The results of these bomb runs were used to promote or demote air crews. ECM activity also took place between the bombers and the Nike sites. The performance of the NIKE crews improved remarkably with this "live target" practice. Many Nike Hercules batteries were manned by Army National Guard troops, with a single active Army officer assigned to each battalion to account for the unit's nuclear warheads. The National Guard air defense units shared responsibility for defense of their assigned area with active Army units in

2040-403: The area, and reported to the active Army chain of command. This is the only known instance of Army National Guard units being equipped with operational nuclear weapons. Development continued, producing Improved Nike Hercules and then Nike Zeus A and B. The Zeus was aimed at intercontinental ballistic missiles (ICBMs). Zeus, with a new 400,000 lbf (1.78 MN) thrust solid-fuel booster,

2108-546: The car may not even be aware that the transponder is there, because there are no buttons to press. When a key is inserted into the ignition lock cylinder and turned, the car's computer sends a signal to the transponder. Unless the transponder replies with a valid code, the computer will not allow the engine to be started. Transponder keys have no battery; they are energized by the signal itself. Transponders may also be used by residents to enter their gated communities . However, having more than one transponder causes problems. If

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2176-695: The content of the received signal or signals. A communications satellite ’s channels are called transponders because each is a separate transceiver or repeater . With digital video data compression and multiplexing , several video and audio channels may travel through a single transponder on a single wideband carrier . Original analog video only has one channel per transponder, with subcarriers for audio and automatic transmission identification service ( ATIS ). Non-multiplexed radio stations can also travel in single channel per carrier (SCPC) mode, with multiple carriers (analog or digital) per transponder. This allows each station to transmit directly to

2244-466: The continental United States until 1974. The Alaskan sites were deactivated in 1978 and Florida sites stood down during the following year. Although the missile left the U.S. inventory, other nations maintained the missiles in their inventories into the early 1990s and sent their soldiers to the United States to conduct live-fire exercises at Fort Bliss, Texas. Leftover traces of the approximately 265 Nike missile bases can still be seen around cities across

2312-478: The country which had very similar acquisition and tracking radar, plus similar computerized plotting boards which were used to record the bomber tracks and bomb release points. Airmen from these sites were assigned TDY to Nike sites across the country to train the Nike crews in RBS procedures. The distances from the simulated bomb landing point and the "target" were recorded on paper, measured, encoded, and transmitted to

2380-645: The country. As the sites were decommissioned they were first offered to federal agencies. Many were already on Army National Guard bases who continued to use the property. Others were offered to state and local governments while others were sold to school districts. The left-overs were offered to private individuals. Thus, many Nike sites are now municipal yards, communications and FAA facilities (the IFC areas), probation camps, and even renovated for use as Airsoft gaming and MilSim training complexes. Several were obliterated and turned into parks. Some are now private residences. Only

2448-565: The goddess of victory from Greek mythology ). The missile's first-stage solid rocket booster became the basis for many types of rocket including the Nike Hercules missile and NASA 's Nike Smoke rocket , used for upper-atmosphere research. Project Nike began during 1944 when the War Department demanded a new air defense system to combat new jet aircraft , as existing gun-based systems proved largely incapable of dealing with

2516-476: The intercept point and steer the missile. The entirety of this system was provided by the Bell System's electronics firm, Western Electric . The Douglas -built missile was a two-stage missile using a solid fuel booster stage and a liquid fueled ( IRFNA / UDMH ) second stage . The missile could reach a maximum speed of 1,000 mph (1,600 km/h), an altitude of 70,000 ft (21 km) and had

2584-468: The larger size of the Nike Hercules, an underground magazine's capacity was reduced to eight missiles. Thus, storage racks, launcher rails, and elevators underwent modification to accept the larger missiles. Two additional features that readily distinguished newly converted sites were the double fence and the kennels housing dogs that patrolled the perimeter between the two fences. The Nike Hercules

2652-677: The launcher loaders. Fruehauf Trailer Corporation produced the trailers. After disputes between the Army and the Air Force (see the Key West Agreement ), all longer-range systems were assigned to the Air Force during 1948. They merged their own long-range research with Project Thumper , while the Army continued to develop Nike. During 1950 the Army formed the Army Anti-Aircraft Command (ARAACOM) to operate batteries of anti-aircraft guns and missiles. ARAACOM

2720-465: The missile could be pushed manually along a railing to a launcher placed parallel to the elevator. Typically, four launchers sat atop the magazine. Near the launchers, a trailer housed the launch control officer and the controls he operated to launch missiles. In addition to the launch control trailer, the launch area contained a generator building with three diesel generators, frequency converters, and missile assembly and maintenance structures. Because of

2788-461: The missiles (missile tracking), along with the computer systems to plot and direct the intercept. The second part (designated L), around forty acres (160,000 m ), held 1–3 underground missile magazines each serving a group of four launch assemblies and included a safety zone. The site had a crew of 109 officers and men who ran the site continuously. One launcher would be on 15 minutes alert, two on 30 minutes and one on two hour alert. The third part

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2856-482: The missiles in the Launch Area and the missile-tracking-radar in the Battery Control Area. The first Nike sites featured above-ground launchers. This quickly changed as land restrictions forced the Army to construct space-saving underground magazines. Capable of hosting 12 Nike Ajax missiles, each magazine had an elevator that lifted the missile to the surface in a horizontal position. Once above ground,

2924-433: The northeast and east, those numbered 26 to 50 were to the southeast and south, those numbered 51 to 75 were to the southwest and west, and those numbered 76 to 99 were to the northwest and north. The Defense Areas in the Continental United States were identified by a one- or two-letter code which were related to the city name. Thus those Nike sites starting with C were in the Chicago Defense Area, those starting with HM were in

2992-689: The only anti-aircraft artillery remaining in use by the US. By 1957 the Regular Army AAA units had been replaced by missile battalions. During 1958 the Army National Guard began to replace their guns and adopt the Ajax system. Each launch site had three parts, separated by at least 1,000 yards (914 m). One part (designated C) of about six acres (24,000 m ) contained the IFC (Integrated Fire Control) radar systems to detect incoming targets (acquisition and target tracking) and direct

3060-407: The planners chose fixed sites well away from the defended area and the Corps of Engineers Real Estate Offices began seeking tracts of land in rural areas. However, Army planners determined that close-in perimeter sites would provide enhanced firepower. Staggering sites between outskirt and close-in locations to urban areas gave defenders a greater defense-in-depth capability. Each Nike missile battery

3128-466: The power requirements during long flights. Transponders are used on some military aircraft to ensure ground personnel can verify the functionality of a missile’s flight termination system prior to launch. Such radar-enhancing transponders are needed as the enclosed weapon bays on modern aircraft interfere with prelaunch, flight termination system verification performed by range safety personnel during training test launches. The transponders re-radiate

3196-571: The project was canceled in favor of the Thor based Program 437 system during 1966. In the end, neither development would enter service. However, the Nike Zeus system did demonstrate a hit-to-kill capability against ballistic missiles during the early 1960s. See National Missile Defense and anti-ballistic missile (ABM) systems. Nike Hercules was included in SALT I discussions as an ABM. Following

3264-610: The same defensive capability. Regular Army batteries were either upgraded to the Hercules system or decommissioned. Army National Guard units continued to use the Ajax system until 1964, when they too upgraded to Hercules. Eventually, the Regular Army units were replaced by the National Guard as a cost-saving measure, since the Guard units could return to their homes when off duty. A Nike Ajax missile accidentally exploded at

3332-530: The satellite, rather than paying for a whole transponder, or using landlines to send it to an earth station for multiplexing with other stations. In fiber-optic communications , a transponder is the element that sends and receives the optical signal from a fiber . A transponder is typically characterized by its data rate and the maximum distance the signal can travel. The term "transponder" can apply to different items with important functional differences, mentioned across academic and commercial literature: As

3400-850: The signals allowing for much longer communication distances. The International Maritime Organization 's International Convention for the Safety of Life at Sea (SOLAS) requires the Automatic Identification System (AIS) to be fitted aboard international voyaging ships with 300 or more  gross tonnage  (GT), and all passenger ships regardless of size. AIS transmitters/receivers are generally called transponders , but they generally transmit autonomously, although coast stations can interrogate class B transponders on smaller vessels for additional information. In addition, navigational aids often have transponders called RACON (radar beacons) designed to make them stand out on

3468-506: The speeds and altitudes at which jet aircraft operated. Two proposals were accepted. Bell Laboratories offered Project Nike while General Electric proposed a much longer-ranged, collision-course system named Project Thumper , which eventually delivered the BOMARC missile . Bell Labs' proposal would have to deal with bombers flying at 500 mph (800 km/h) or more, at altitudes of up to 60,000 ft (20,000 m). At these speeds, even

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3536-436: The start/finish line. Each individual runner or car has an active transponder with a unique ID code. When the individual passes the start/finish line, the lap time and the racing position is shown on the score board. Passive and active RFID systems are used in motor sports , and off-road events such as Enduro and Hare and Hounds racing, the riders have a transponder on their person, normally on their arm. When they complete

3604-621: The system. Nike-X considered retaining the longer range Zeus missile, and later developed an extended range version known as Zeus EX . It played a secondary role in the Nike-X system, intended primarily for use in areas outside the Sprint protected regions. Nike-X required at least one interceptor missile to attack each incoming warhead. As the USSR's missile fleet grew, the cost of implementing Nike-X began to grow as well. Looking for lower-cost options,

3672-467: The transponder sends back a transponder code (or "squawk code", Mode A) or altitude information (Mode C) to help air traffic controllers to identify the aircraft and to maintain separation between planes. Another mode called Mode S (Mode Select) is designed to help avoiding over-interrogation of the transponder (having many radars in busy areas) and to allow automatic collision avoidance. Mode S transponders are backward compatible with Modes A and C. Mode S

3740-420: The value of the Nike (aircraft) air defense system. Beginning around 1965, the number of Nike batteries was reduced. Thule air defense was reduced during 1965 and SAC air base defense during 1966, reducing the number of batteries to 112. Budgetary cuts reduced that number to 87 in 1968, and 82 in 1969. Some small-scale work to use Nike Zeus as an anti-satellite weapon (ASAT) was carried out from 1962 until

3808-497: The warhead damage. Nike Hercules batteries at SAC bases and in Hawaii were installed in an outdoor configuration. In Alaska, a unique above-ground shelter configuration was provided for batteries guarding Anchorage and Fairbanks. Local Corps of Engineer Districts supervised the conversion of Nike Ajax batteries and the construction of new Nike Hercules batteries. Nike missiles remained deployed around strategically important areas within

3876-534: Was a U.S. Army project, proposed in May 1945 by Bell Laboratories , to develop a line-of-sight anti-aircraft missile system. The project delivered the United States' first operational anti-aircraft missile system, the Nike Ajax , in 1953. A great number of the technologies and rocket systems used for developing the Nike Ajax were re-used for a number of functions, many of which were given the "Nike" name (after Nike ,

3944-481: Was designed to defend Minuteman ICBMs, and which was also based on the Nike-X system. It became operational in 1975, but was shut down after just three months. Nike-X was a proposed US Army anti-ballistic missile (ABM) system designed to protect major cities in the United States from attacks by the Soviet Union 's ICBM fleet. The name referred to its experimental basis, it was intended to be replaced by

4012-432: Was designed to use existing Nike Ajax facilities. With the greater range of the Nike Hercules allowing for wider area coverage, numerous Nike Ajax batteries were permanently deactivated. In addition, sites located further away from target areas were desirable due to the nuclear warheads carried by the missile. Unlike the older Ajax sites, these batteries were placed in locations that optimized the missiles' range and minimized

4080-416: Was divided into two basic parcels: the Battery Control Area and the Launch Area. The Battery Control Area contained the radar and computer equipment. Housing and administration buildings, including the mess hall, barracks, and recreation facilities, were sometimes located in a third parcel of land. More likely, however, the housing and administration buildings were located at either the Battery Control Area or

4148-529: Was first test launched during August 1959 and demonstrated a top speed of 8,000 mph (12,875 km/h). The Nike Zeus system utilized the ground-based Zeus Acquisition Radar (ZAR), a significant improvement over the Nike Hercules HIPAR guidance system. Shaped like a pyramid, the ZAR featured a Luneburg lens receiver aerial weighing about 1,000 tons. The first successful intercept of an ICBM by Zeus

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4216-532: Was in 1962, at Kwajalein in the Marshall Islands . Despite its technological advancements, the Department of Defense terminated Zeus development in 1963. The Zeus system, which cost an estimated $ 15 billion , still suffered from several technical flaws that were believed to be uneconomical to overcome. Still, the Army continued to develop an anti-ICBM weapon system referred to as "Nike-X" – that

4284-626: Was largely based on the technological advances of the Zeus system. Nike-X featured phased-array radars, computer advances, and a missile tolerant of skin temperatures three times those of the Zeus. In September 1967, the Department of Defense announced the deployment of the LIM-49A Spartan missile system, its major elements drawn from Nike X development. In March 1969. the Army started the anti-ballistic missile Safeguard Program , which

4352-496: Was largely useless by mid-1960s when it would be facing hundreds. It was calculated that a salvo of only four ICBMs would have a 90% chance of hitting the Zeus base, as their radars could only track a few warheads at the same time. Worse, the attacker could use radar reflectors or high-altitude nuclear explosions to obscure the warheads until they were too close to attack, making a single warhead attack highly likely to succeed. Nike-X addressed these concerns by basing its defense on

4420-470: Was not sufficient. The MTR also commanded the missile by way of pulse-position modulation , the pulses were received, decoded and then amplified back for the MTR to track. Once the tracking radars were locked the system was able to work automatically following launch, barring any unexpected occurrences. The computer compared the two radars' directions, along with information on the speeds and distances, to calculate

4488-503: Was renamed the US Army Air Defense Command (USARADCOM) during 1957. It adopted a simpler acronym, ARADCOM, in 1961. The first successful Nike test was during November 1951, intercepting a drone B-17 Flying Fortress . The first type, Nike Ajax (MIM-3), were deployed starting in 1953. The Army initially ordered 1,000 missiles and 60 sets of equipment. They were placed to protect strategic and tactical sites within

4556-651: Was the administrative area (designated A), which was usually co-located with the IFC and contained the battery headquarters, barracks, mess, recreation hall, and motor pool. The actual configuration of the Nike sites differed depending on geography. Whenever possible the sites were placed on existing military bases or National Guard armories; otherwise land had to be purchased. The Nike batteries were organized in Defense Areas and placed around population centers and strategic locations such as long-range bomber bases, nuclear plants, and (later) ICBM sites. The Nike sites in

4624-459: Was used in the Hercules system. At sites in the United States the missile almost exclusively carried a nuclear warhead. Sites in foreign nations typically had a mix of high explosive and nuclear warheads. The fire control of the Nike system was also improved with the Hercules and included a surface-to-surface mode which was successfully tested in Alaska. The mode change was accomplished by changing

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