B61 nuclear gravity bomb

First deployed in 1967, the B61 is a drogue-retarded nuclear bomb that can be dropped by tactical aircraft and bombers at high speeds from low altitudes. The B61-0 (B61 Mod 0) through B61-5 have improved safety features and delivery methods. The B61-3 was the first U.S. nuclear weapon to use microprocessor-based arming and firing sequence circuits.

The weapon can be set for ground burst, air burst or time-delay detonation. It is delivered by a level bombing laydown as low as 50...