High Quality Content by WIKIPEDIA articles! The Trident missile is a submarine-launched ballistic missile (SLBM) equipped with multiple independently-targetable reentry vehicles (MIRV). The Fleet Ballistic Missile (FBM) is armed with nuclear warheads and is launched from nuclear-powered ballistic missile submarines (SSBNs). Trident missiles are carried by fourteen active US Navy Ohio-class submarines, with US warheads, and four Royal Navy Vanguard-class submarines, with British warheads. The original prime contractor and developer of the missile was Lockheed Martin Space Systems.