CHRONOLOGY 16 July 19h5 First nuclear device exploded at Trinity, New Mexico, introduced the atomic weapon era, 6 August 19L5 Atomic bomb dropped on Hiroshima, Japan, 9 August 19L5 Atomic bomb dropped on Nagasaki, Japan, -- July 1916 | April-May 198 January= February 1951 _Operation RANGER conducted at Nevada -Proving Grounds, OctoberNovember 1951 Operation BUSTER/JANGLE conducted at 1 April 1952 Special Weapons Command, redesignated Air Force Special Weapons Center, became part of the Air Research and Development Command. April—June 1952 1 July 1952 --November 1952 March-June 1953 March-May 1954 Operation CASTLE conducted at Eniwetok and Bikini Atolls in Pacific, w ll May 195k Air Research and Development Command directed the Special Weapons Center to undertake airto-air nuclear warhead rocket development. Operation CROSSROADS conducted at Bikini Atoll in Pacific, Operation SANDSTONE conducted at Eniwetok Atoll in Pacific. Nevada Proving Grounds, Operation TUMBLER/SNAPPER conducted at Nevada Proving Grounds, Indian Springs Air Force Base transferred from Air Training Command to Special Weapons Center, Operation IVY conducted at Eniwetok Atoll in Pacific. Operation UPSHOT/KNOTHOLE conducted at Nevada Proving Grounds, viii APA SWEH-2-003)