Bomb, Mark 39, at NMUSAF Published on January 24, 2013 in 24 January 1961Full resolution (1800 × 1197) ← Previous Next → Bomb, Mark 39Y1 Mod 2, P/N 300611-00, serial number 4215, at the National Museum of the United States Air Force. Behind it is a Convair B-36 Peacemaker ten-engine strategic bomber. (U.S. Air Force)