The launch of a Nuclear Ballistic Missle from a Nuclear Powered Submarine.
The Polaris A1 weighed 28,800 lb, with a length 28.5 ft and diameter 54 in., it had a range of approximately 1000 nm. The first stage (18,400 lb) had a steel motor case; polyurethane propellant (15,200 lb) with ammonium percholorate (oxidizer) and aluminum additives. The second stage (9,400 lb) also used a steel motor case; polyurethane propellant (7,300 lb) with ammonium perchlorate (oxidizer) and aluminum additives.
The launch of a Lockheed-built Polaris A1 Fleet Ballistic Missile was the first in history from a submerged submarine, the USS George Washington (SSBN 598). It occurred July 20, 1960, off Cape Canaveral, Florida, and within three hours a second Polaris test missile was launched.
On November 15, 1960, the submarine and its 16 Polaris A1s began the first patrol.