(United States)

Notes: This submarine-to-submarine missile was designed to capitalize on the USN’s lead in sonar detection ranges. The Subroc was launched horizontally from standard 21” torpedo tubes, after traveling a safe distance from the launch submarine, the rocket ignited underwater and carried the missile to the surface. It flew a predetermined time before the nuclear warhead separated; the warhead itself had small guidance fins to control it’s re-entry into the water.

A target submarine would have almost no chance to react due to the fact that sonar could not detect the in-flight missile, and the lethal blast radius (about 5-6NM) would make escape difficult regardless. (Contrary to popular rumours, there was not a non-nuclear variant)

About 300 were produced by Goodyear between 1965 and 1972. In 1991, they were withdrawn from service. It was planned to replace them with the UUM-125A Sea Lance; this programme was itself cancelled and today USN subs have no standoff weapon.