a helicopter landing zone. The warheads were mounted on a platform and pulled by parachutes from the rear-loading ramp of C-130s. After clearing the aircraft the large extraction chutes and pallets were cut away and small triangular chutes stabilized the large warhead until impact. A nose probe detonated the bomb at the correct stand-off distance. One of the last of the World War II Tallboy designs was dropped during a Commando Vault mission to clear a landing zone for helicopters on a ridge during the 1969 Battle of Hamburger Hill in Vietnam. Dropping from , the bomb hit exactly where it was needed. The Commando Vault missions were more accurate in bomb delivery on target than the more modern B-52s. Work still progressed on the T-12 Cloudmaker, which could be carried by the Convair B-36A. See also ASM-A-1 Tarzon Bunker buster Grand Slam Notes References (June 1944 , July 1944 , August 1944 , September 1944 , October 1944 ,November 1944 , December 1944 , January 1945 , February 1945 , March 1945 , April and May 1945) Further reading External links Barnes Wallis Trust A picture of a Lancaster carrying a Grand Slam Article about the defusing of the unexploded Tallboy in the Hamburger Abendblatt "Huge Bomb Drills Into Target Before Exploding." Popular Mechanics, February 1945, p. 49. Tallboy at the International Bomber Command Centre Digital Archive Anti-fortification weapons World War II aerial bombs of the United Kingdom Barnes Wallis Weapons and ammunition introduced in 1944