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W54

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66: 38: 50: 58: 189:. First production date for the Falcon warhead was planned for February 1961 while the warhead for the Davy Crockett was given a planned first production date of October 1961. This was because it was felt that the higher acceleration experienced by the warhead in Davy Crockett service would make certification of parts more challenging. 270:
gun-type artillery shell and that transport required four men, each carrying a 40-pound (18 kg) section of the weapon. It was felt that the XW-54 SADM proposal could produce a weapon of 11.875 inches (301.6 mm) diameter, 17.5 inches (440 mm) long and a weight of 56 pounds (25 kg)
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Although there is no hard evidence to directly link Wee Gnat to Wee Gwen, the usual naming convention used by the British for engineered American designs supplied under the 1958 Bilateral Agreement, was to use a name beginning with the same letter of the alphabet, and Gwen and Wee Gwen follows that
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for Davy Crockett use began. The XW-54-X2 warhead would lack any environmental sensing device for initial deployment, while the XW-54-X1 fitted with a suitable environmental sensing device would replace the XW-54-X2 as the weapon became available. Sandia were against the development of the XW-54-X2
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Configured in the Davy Crockett role, the weapon contained two sets of fuzes: a radar based fuze set for a 40 feet (12 m) airburst and a capacitance based fuze set for 2 feet (0.61 m) airburst. These fuzes represented the high and low airburst modes of the weapon. The device contained 26
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SADM began in August 1964. The weapon was 12 inches (305 mm) diameter, 18 inches (457 mm) long and weighed 58.5 pounds (26.5 kg), and included the warhead, fuzing and firing system with a mechanical timer, ferroelectric firing set and a sealed housing. The body was constructed with
243:) was achieved in April 1961. Both the Mod 0 and Mod 2 weapons were interchangeable by changing the environmental sensing device. The final weapon was 10.862 inches (275.9 mm) in diameter, 15.716 inches (399.2 mm) in length and 50.9 pounds (23.1 kg) in weight, and was packaged in a 356:
The B54 SADM included a Field Wire Remote Control System (FWRCS), a device that enabled the sending of safe/arm and firing signals to the weapon via a wire for safe remote detonation of the weapon by troops. This system was tested for its resistance to electromagnetic radiation in February 1964.
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It was hoped during development that the same warhead for both applications could be used, but the requirements for the environmental sensing device - used to detect if the weapon was in its correct military environment and in turn disable weapon safing devices - for each application was quite
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from a stationary 155-millimeter launcher and set to detonate low airburst 1.7 miles (2.7 km) from the launch point. This test was the last atmospheric test at Nevada Test Site and was performed in conjunction with Operation Ivy Flats, a simulated military environment. It was observed by
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Some sources give the yield for the Mod 0 as 250 tons of TNT (1,000 GJ) and the Mod 2 as 10 to 20 tons of TNT (42 to 84 GJ), but declassified warhead development documents indicate the only difference between these two warheads was the environmental sensing devices used and that the
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Sandia reported the problem in May 1959, stating that if Falcon warheads had the greater priority, an interim environmental sensing device could be developed. The Air Force subsequently accelerated the availability date for the Falcon missile and Sandia design released the warhead without an
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aluminium forgings and moulded fibreglass, and foam-rubber insulation was used between the warhead and case. Dials were illuminated with a tritium-phosphor paint for easy night-reading. A housing for underwater emplacement was provided which included external controls.
138:(SADM) system, along with several mods for each version. The two types are distinct in that much of the design between them was different, to the point that during the development of the SADM it was proposed that it be given its own unique mark designation. 344:
It has been alleged that the British "Wee Gwen" warhead was a copy of the W54. Though never put into production, Wee Gwen was to contain 1.6 kilograms (3.5 lb) of plutonium and 2.42 kilograms (5.3 lb) uranium.
289:) was put into production in April 1963. Drop tests for this weapon were conducted at velocities up to 31 feet per second (9.4 m/s) vertical and 17 feet per second (5.2 m/s) horizontal without damage. 689: 274:
Development began June 1960. Because much of the weapon would be different from the XW-54 warhead, it was proposed that the warhead be given its own unique mark designation, such as TX-58 (later used for the
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For both the Falcon and Davy Crockett, the Department of Defense would supply the weapon systems and adaptation kits for the warheads, while the warheads and firing systems would be the responsibility of the
259:(SADM) began in February 1958 when the Army desired a new munition that could be carried by one man. The project was delayed by the needs of the Falcon and Davy Crockett application until November 1959. 341:
warheads were field convertible, suggesting the weapons had the same yield. Official documents give the yield as 20 tonnes of TNT (84 GJ) when configured in the XM388 round for the Davy Crockett.
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The weapon was delayed until August 1963 due to issues with the timer. These included premature firing of the timer and issues with bearing materials. An interim Mk 54 Mod 0 weapon (now called the
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environmental sensing device in October 1959. However, revisions were issued in December before warhead production began with a suitable environmental sensing device for Falcon use.
232:) in July 1960 after parts manufacturing slippage delayed production of the warhead. This also caused the accelerated schedule for the Falcon application to slip to January 1961. 448:
television-guided glide bomb system. The W72 variant had a yield of around 600 tons of TNT. The 300 W72 units were produced between 1970 and 1972 and were in service until 1979.
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in the late 1950s. The weapon is notable for being the smallest nuclear weapon in both weight and yield to have entered US service. It was a compact implosion device containing
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including carrying case. The weapon would also have a waterproof housing, have a pack for carrying in the field and a shock-mitigating container for parachute delivery.
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started production in June 1965. The weapon was the same size as previous mods, but now weighed 70 pounds (32 kg). This may be the highest yield
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W54 mod numbers overlap between the warhead and SADM weapon. Weapons of the same mod number but in different applications are not the same weapons.
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convention. The US and British warheads also share an identical diameter, an identical length, an identical weight, and identical yields.
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Interest in a lightweight, low-yield weapon for the Falcon and Davy Crockett began in 1958. The weapon was initially developed by the
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After the AIM-26 Falcon was retired, 300 units were rebuilt into an improved configuration with a higher yield and redesignated the
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Electromagnetic Radiation Susceptibility of the B54-0 (SADM) and the Field Wire Remote Control System (U)
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A single environmental sensing device for both systems was abandoned at this time and development on the
1754: 1239: 1749: 385:– Interim warhead for Davy Crockett. Lacked environmental sensing device. Never entered production. 1744: 1739: 1014: 583: 1105: 1729: 952: 839: 494: 101: 804:(Report). Headquarters Field Command, Defense Atomic Support Agency. p. 260. DASA-69-0492. 1770: 1734: 305: 1680: 1675: 1670: 1665: 1598: 1588: 1573: 1548: 1543: 1538: 1523: 1503: 1493: 1488: 1458: 1448: 1217: 1212: 1197: 1110: 1100: 1095: 1085: 1075: 1070: 881: 799:
Semiannual Historical Report, Activities for the Period 1 July 1969 - 31 December 1968, Vol I
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Safety Rules for Peacetime Operations with the DAVY CROCKETT/MK54 Mod 2 Atomic Weapon System
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as its fissile material, and in its various versions and mods it had a yield of 10 to 1,000
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The Department of Defense cancelled the requirement for the XW-54-X2 (now called the
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designation, but in January 1959 the development of the weapon was transferred to
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device. Scarab was also used as a primary stage in the thermonuclear weapon test
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as simply disconnecting the adaptation kit would disable the weapon's safeties.
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Weapons Department Atomic Warheads Production Committee, Papers & Minutes
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Operational Review of the XM-129/XM-159 Atomic Demolition Charge (B54 SADM)
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The proposal noted that the existing atomic demolition munition (ADM), the
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Yield is estimated to be 10 to 1,000 tons of TNT (42 to 4,184 GJ).
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housing coated in a conductive lacquer to provide an electrical shield.
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The SADM (B54) demolition charge version of the W54 in its carry bag.
37: 1780: 1775: 415:– Production weapon. Came with special housing for underwater use. 867: 958: 282:), but the decision was made to retain the existing mark number. 49: 45:
projectile. The unusually small size of the warhead is apparent.
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The weapon had two distinct versions: a warhead used in the
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University of California Radiation Laboratory at Livermore
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Three mods of the warhead configuration were developed:
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Production of both the Falcon warhead (now called the
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Three mods of the SADM configuration were developed:
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different. In Falcon use, the warhead experienced 17
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The W54 nuclear warhead was used in the man-portable
916: 1793: 82:high-altitude low-opening military freefall jump 582:(Report). Sandia National Labs. February 1968. 379:– Warhead for AIM-4 Falcon air-to-air missile 902: 770: 677: 675: 653: 628: 603: 574: 572: 570: 568: 566: 564: 562: 560: 395:when configured into a Davy Crockett round. 558: 556: 554: 552: 550: 548: 546: 544: 542: 540: 525:"Complete List of All U.S. Nuclear Weapons" 909: 895: 424:In service, the weapons were known as the 672: 518: 516: 514: 512: 510: 472:(July 17), the warhead was launched as a 537: 522: 337:pounds (12 kg) of high explosives. 145:, which was a rebuilt W54 used with the 64: 56: 48: 36: 14: 1794: 749:(Report). p. 63. TNA AB 16/4675. 722:from the original on 27 September 2018 707: 507: 1802:Nuclear warheads of the United States 890: 716:"Wee Gwen - British Army Requirement" 713: 695:from the original on 1 September 2021 152:. The W72 was in service until 1979. 838:. United States Army. 17 July 1963. 738: 409:– Interim weapon with timer issues. 1277:Tactical Atomic Demolition Munition 745:UK Atomic Energy Authority (1964). 205:(98 m/s) or under less than 2 24: 1271:Special Atomic Demolition Munition 771:Bartlett, J G (11 February 1964). 399:Special Atomic Demolition Munition 349:Special Atomic Demolition Munition 257:Special Atomic Demolition Munition 251:Special Atomic Demolition Munition 136:Special Atomic Demolition Munition 25: 1813: 1265:Medium Atomic Demolition Munition 857: 481:and presidential adviser General 320:device, which descended from the 811:from the original on 4 June 2021 779:from the original on 25 May 2021 714:Brian, Burnell (15 April 2018). 523:Sublette, Carey (12 June 2020). 464:on July 7 and July 17, 1962. In 842:from the original on 2021-12-13 826: 791: 775:(Report). Sandia National Lab. 753:from the original on 2021-05-23 586:from the original on 2021-05-22 430:XM159 Atomic Demolition Charges 864:List of all US Nuclear Weapons 764: 658:. Vol. VII. p. 170. 647: 622: 597: 435: 264:T-4 Atomic Demolition Munition 175:Los Alamos National Laboratory 155: 127:air-to-air missile and in the 27:Nuclear warhead used by the US 13: 1: 918:United States nuclear devices 500: 456:Stockpiled W54 warheads were 1629:Reliable Replacement Warhead 633:. Vol. VI. p. 57. 368: 331: 316:The weapon was based on the 209:per second (20 m/s/s). 141:A later development was the 7: 608:. Vol. V. p. 14. 580:History of the Mk 54 Weapon 488: 360: 30:For the train station, see 10: 1818: 451: 160: 134:, and another used in the 29: 1763: 1722: 1695: 1658: 1647: 1426: 1410: 1299: 1290: 1238: 1175: 1144: 1033: 937: 924: 873:W54 at GlobalSecurity.org 311: 187:Atomic Energy Commission 102:tactical nuclear warhead 71:U.S. Army Special Forces 495:List of nuclear weapons 308:version of the weapon. 61:SADM hard carrying case 868:Nuclear Weapon Archive 85: 62: 54: 46: 882:Brookings Institution 835:Ivy Flats Film Report 654:Chuck Hansen (2007). 629:Chuck Hansen (2007). 604:Chuck Hansen (2007). 177:and redesignated the 68: 60: 52: 40: 656:Swords of Armageddon 631:Swords of Armageddon 606:Swords of Armageddon 474:Davy Crockett device 266:, was based on the 92:(also known as the 43:M-388 Davy Crockett 292:Production of the 86: 63: 55: 47: 1789: 1788: 1718: 1717: 1643: 1642: 1286: 1285: 1240:Atomic demolition 878:The Davy Crockett 665:978-0-9791915-7-2 640:978-0-9791915-6-5 615:978-0-9791915-5-8 483:Maxwell D. Taylor 479:Robert F. 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Index

W-54
Bifuka Station

M-388 Davy Crockett



U.S. Army Special Forces
paratrooper
Green Light Teams
high-altitude low-opening military freefall jump
tactical nuclear warhead
United States
plutonium-239
tons of TNT
gigajoules
AIM-26 Falcon
Davy Crockett
recoilless gun
Special Atomic Demolition Munition
AGM-62 Walleye
guided bomb
University of California Radiation Laboratory at Livermore
Los Alamos National Laboratory
Atomic Energy Commission
fiberglass
T-4 Atomic Demolition Munition
Mark 9
Polaris A-3
warhead

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