The Mk-53 “hydrogen” bomb, first produced in 1962, was designed to be carried internally by B-47, B-52, B-58 and B-70 aircraft. It was equipped with five parachutes: one 5-foot pilot chute, one 16-foot chute and three 48-foot chutes. If for some reason a free-falling delivery was required, the parachute “can” could have been blown out, thereby jettisoning all chutes. With a yield in the megaton range, Mk-53s had an air burst, contact burst and “laydown” (delayed action detonation) capability. The Mk-6 re-entry vehicle installed on the Titan II ICBM contained a W53 warhead, basically the same as the Mk-53 bomb.