Medium Atomic Demolition Munition (MADM) was a
In service, the MADM was known as the M167, M172 and M175 Atomic Demolition Charges (ADCs).
The history of the MADM began in 1954 with the proposal for a light-weight multi-purpose warhead. Its predecessor, the first atomic demolition munition (ADM), was deployed in the same year. This was a low-yield weapon (0.5 to 15 kilotonnes of TNT (2.1 to 62.8 TJ)) used by special forces and commando teams to destroy enemy infrastructure such as bridges tunnels, and harbors, among others. The MADM warhead was designed to be economical in nuclear material, having a diameter of less than 15 inches (380 mm), and it was hoped that the device could be broken down into sub-40 pounds (18 kg) components for carriage and assembly in the field.
The program languished for several years, with Los Alamos and Sandia in a joint letter suggesting that warheads in the range of 12 to 18 inches (300 to 460 mm) were possible. At one point, the
Possible devices for the program were tested in
In February 1957, it was believed that the weapon could be design released by mid-1958 with production beginning a year later. In March 1957, it was suggested that the W44 and W45 programs be consolidated. This proposal was later abandoned. At this point, it was believed the design would have a maximum diameter of 11.75 inches (298 mm), a length of 27 inches (690 mm), and a weight of 150 pounds (68 kg). Major components of the weapon were sourced from other weapon systems.
In September 1957, the warhead operational availability date was delayed by 14 months. In February 1958, for still-classified reasons, the weapon received a significant redesign and a new developmental name: XW-45-X1. This, however, increased the weapon diameter to 12.75 inches (324 mm) and made the warhead incompatible with Little John without substantial redesign. In the interest of economics and stockpile simplification, it was decided to revert to the original XW-45 design in February 1959.
In January 1960, the MADM version of the W45 was assigned the name W45 Mod 1. This version of the warhead was only different from the W45 Mod 0 used in Little John and Terrier in that it had no environmental sensing device, the ADM role having precluded the possibility of such a device. Instead, the warhead received a three-digit combination padlock to restrict access to the device. War reserve production was achieved in April 1962.
In October 1963, the army informed the Atomic Energy Commission that the usefulness of the weapon was limited by the inability to emplace the weapon underwater or in backfilled holes. Sandia and Livermore replied in December 1963, proposing a watertight case for the weapon featuring waterproof cables and connectors. A prototype was demonstrated in January 1963 and production of the case was authorized the following month.
At about the same time, it was proposed that the weapon be fitted with a
The MADM was retired in 1984.
In its waterproof case, the weapon was 42 inches (1.1 m) long, 24 inches (0.61 m) wide, 28 inches (0.71 m) high and weighed 391 pounds (177 kg).
ADM employment manuals describe the use of ADMs tactically in both offensive and defensive operations.
In offensive operations, ADMs are described as being useful for improving flank and rear security of a unit, impeding counterattacks, and assisting in enemy entrapment.
Engineering and defensive use
ADM employment manuals describe the use of ADMs defensively for combat engineering purposes. Possible targets described include bridges, dams, canals, tunnels, airfields, railroad marshaling yards, ports and industrial plants, and power facilities.
Extensive tables were provided to enable the selection of the correct yield for each particular target. These tables accounted for various employment particulars such as depth of burial, fallout considerations, and minimum safe separation distances between adjacent weapons and personnel.
- Air Transport Procedures, Transport of the W45-3 Warhead in Container, H815, For Medium Atomic Demolition Munition (MADM) by US Army Helicopters (PDF) (Report). Headquarters, Department of the Army. August 1983. FM 55-226. Archived (PDF) from the original on 2021-08-31.
- History of the Mark 45 Warhead, p. 8.
- History of the Mark 45 Warhead, p. 10.
- History of the Mark 45 Warhead, p. 11-12.
- History of the Mark 45 Warhead, p. 12-13.
- History of the Mark 45 Warhead, p. 13-14.
- History of the Mark 45 Warhead, p. 16.
- History of the Mark 45 Warhead, p. 18-19.
- History of the Mark 45 Warhead, p. 19-21.
- History of the Mark 45 Warhead, p. 21.
- History of the Mark 45 Warhead, p. 24.
- History of the Mark 45 Warhead, p. 25.
- History of the Mark 45 Warhead, p. 26-27.
- History of the Mark 45 Warhead, p. 27.
- History of the Mark 45 Warhead, p. 28.
- Sublette, Carey (12 June 2020). "Complete List of All U.S. Nuclear Weapons". Nuclear weapon archive. Archived from the original on 2009-02-27. Retrieved 2021-03-18.
- History of the Mark 45 Warhead, p. 13.
- Sublette, Carey (15 October 1997). "Operation Hardtack II". Nuclear Weapon Archive. Retrieved 31 August 2021.
1-point test of W-45/Swan variant, successful
- History of the Mark 45 Warhead, p. 15.
- Employment of Atomic Demolition Munitions (ADM), Chapter 3.
- Employment of Atomic Demolition Munitions (ADM), Page 3-1.
- Employment of Atomic Demolition Munitions (ADM), Chapter 6.
- Employment of Atomic Demolition Munitions (ADM) (Report). Headquarters, Department of the Army. August 1971. FM 5-26.
- History of the Mark 45 Warhead (Report). Sandia National Labs. SC-M-67-677. Archived from the original on 2021-08-31.