Nuclear fission the Manhattan Project during World War II (September 1, 1939 – September 2, 1945) carried out most of the early scientific work on fission chain reactions, culminating in the three events involving fission bombs that occurred during the war. The first fission bomb, codenamed "The Gadget", was detonated during the Trinity Test in the desert of New Mexico on July 16, 1945. Two other fission bombs, codenamed "Little Boy" and "Fat Man", were used in combat against the Japanese cities of Hiroshima and Nagasaki in on August 6 and 9, 1945 respectively. Even the first fission bombs were thousands of
393d Bomb Squadron 393d Bomb Squadron The 393d Bomb Squadron is part of the 509th Bomb Wing at Whiteman Air Force Base, Missouri. It operates Northrop Grumman B-2 Spirit nuclear-capable strategic bomber aircraft. The 393d Bombardment Squadron is the only United States Air Force squadron to carry out a nuclear attack on an enemy in combat. During World War II, its aircraft attacked Hiroshima on 6 August 1945 and Nagasaki, Japan 9 August 1945 with atomic bombs. Activated as a Boeing B-29 Superfortress squadron in early 1944; trained under Second Air Force. Due to a shortage of B-29s, the squadron was initially equipped