Polaris A-1 missile at Alden Park on Mare Island

The Polaris missile was a two-stage solid-fuel nuclear-armed submarine-launched ballistic missile (SLBM) built during the Cold War by Lockheed Corporation of California for the United States Navy.

The first version, the Polaris A-1, had a range of 1000 nautical miles (1853 km) and a single Mk 1 re-entry vehicle, carrying a single W-47-Y1 600 kt nuclear warhead, with an inertial guidance system which provided a Circular error probable (CEP) of 1800 meters (6000 ft). The two-stage solid propellant missile had a length of 28.5 ft (8.69 m), a body diameter of 54 in (1.37 m), and a launch weight of 28,800 lbs (13,090 kg).