W66 (nuclear warhead)

The W66 thermonuclear warhead was used on the Sprint anti-ballistic missile system, designed to be a short-range interceptor to shoot down incoming ICBM warheads.

The W66 had a yield of 2 ktTNT and was an enhanced radiation ("neutron") weapon. The W66 was 18 in in diameter and 35 in long, with a weight of approximately 150 lb. The weapon was a two-stage design.

The W66 was based on the Arrow warhead design and by December 1966 had undergone six nuclear tests.