From Wikipedia:
B-52 Stratofortress—31 total (17 in combat, two more being scrapped after sustaining battle damage, and 12 crashed in flight accidents)[7] However, some of the B-52 counted as "crashed in flight accidents" were certainly crashed by missiles or anti-aircraft guns. It is known that when landing on an airfield in Thailand, one B-52 was heavily damaged by SAM, rolled out of the runway and blown up on mines installed around the airfield to protect the guerrillas, only one crewman survived. Subsequently, this B-52 was counted as "crashed in flight accidents"[8]
First losses were operational (non-combat) mid-air collision 2 B-52F 57-0047 and 57-0179 (441st Bomb Squadron, 320th Bomb Wing), 18 June 1965, South China Sea during air refueling orbit, 8 of 12 crewmen killed
Final loss: B-52D 55-0056 (307th Bomb Wing Provisional) to SAM 4 January 1973, crew rescued from Gulf of Tonkin
