The Mark 16 Nuclear Device was the first Thermonuclear deployed Missile Warhead, used in The United States Missile Defense System. Based on the earlier ''Ivy Mike'' Warhead, The Mark 16 was a 25-foot long, 16-foot in diameter Device which weighed 42,000-pounds. The Model was able to detonate a 6 to 8-Megaton yield. The primary deployment platform was standard Case Bombs dropped by B-36 ''Peacekeeper'' Bombers of The US Air Force. Only (5) were ever manufactured in 1954, with all Models retired the following year in 1954 in lieu of larger yield Devices.