A U.S. Air Force Boeing B-52F-70-BW Stratofortress (s/n 57-0162, nicknamed „Casper The Friendly Ghost”) from the 320th Bomb Wing dropping Mk 117 750 lb (340 kg) bombs over Vietnam. This aircraft was the first B-52F used to test conventional bombing in 1964, and later dropped the 50,000th bomb of the „Arc Light” campaign. B-52Fs could carry 51 bombs and served in Vietnam from June 1965 to April 1966 when they were replaced by „Big Belly” B-52Ds which could carry 108 bombs.