The B-61 is a free-fall tactical Thermonuclear Bomb. Carried by attack and bomber aircraft, it is the mainstay of our tactical nuclear arsenal. It is one of the few bombs that can be dropped above Mach 1. It can be slowed from supersonic speeds to 35 mph in under 5 seconds using a 24 foot Nylon and Kevlar blend parachute. One unique feature of the B-61 is the selectable yield for the warhead, also known as Dial-A-Yield. The selections range from 0.3 kilotons to 170 kilotons, or roughly 170,000 tons of TNT. The bomb that we have is NOT a real device, but a training aid. It is the exact size and weight of the actual B-61 and was used to train the crews who loaded armament on the aircraft.