The term 'Submarine Missile' refers to the TRIDENT missile, a submarine-launched ballistic missile developed by the United States. It is a three-stage, solid-fueled, inertial-guided missile with a range of over 4, 600 nautical miles. The TRIDENT missile is capable of carrying multiple independently targetable reentry vehicles, each of which can carry up to eight nuclear warheads. It is the primary armament of the Ohio-class submarines, and is also used by the British Royal Navy's Vanguard-class submarines.