plutonium and uranium. Special Atomic Demolition Munition Yield is estimated to be . 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. Variants 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. Warhead Three mods of the warhead configuration were developed: W54 Mod 0 – Warhead for AIM-4 Falcon air-to-air missile W54 Mod 1 – Interim warhead for Davy Crockett. Lacked environmental sensing device. Never entered production. W54 Mod 2 – Production Davy Crockett warhead with environmental sensing device. Was known as the M-388 when configured into a Davy Crockett round. Special Atomic Demolition Munition Three mods of the SADM configuration were developed: B54 Mod 0 – Interim weapon with timer issues. B54 Mod 1 – Production weapon. Came with special housing for underwater use. B54 Mod 2 – Weapon weight increased from to . May be a boosted weapon. In service, the weapons were known as the XM129 and XM159 Atomic Demolition Charges. Which versions are associated with the XM129 name and which is associated with the XM159 name is not clear. W72 Warhead After the AIM-26 Falcon was retired, 300 units were rebuilt into an improved configuration with a higher yield and redesignated the W72. These warheads were then used to produce a number of nuclear versions of the AGM-62 Walleye 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. Testing Stockpiled W54 warheads were test-fired at the Nevada Test Site on July 7 and July 17, 1962. In Little Feller II (July 7), the warhead was suspended above the ground. In Little Feller I (July 17), the warhead was launched as a Davy Crockett device from a stationary 155-millimeter launcher and set to detonate low airburst 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 Attorney General Robert F. Kennedy and presidential adviser General