The UGM-27 Polaris was a Submarine-launched ballistic missile (SLBM) built during the Cold War by Lockheed Missiles & Space Division in Sunnyvale, California, for the United States Navy. The Polaris program started development in 1956, with its first flight test in 1958. In 1962, the USS Ethan Allen successfully fired a Polaris A-1 missile against a test target in 1960. The SLBM has evolved through Polaris (A2), Polaris (A3), Poseidon (C3), Trident I (C4) and ongoing with today's Trident II (D5). All of these were designed and managed at the Sunnyvale facility. Together, these are known as the Navy's Fleet Ballistic Missile (FBM) Program. Lockheed Martin has been the sole provider of FBM missiles since 1956.