UGM-96 Trident I

UGM-96 Trident I (C4)
The first launch of a Trident I with a drag-reducing aerospike, from Cape Canaveral, on 18 January 1977
Type	SLBM
Place of origin	United States
Service history
Used by	United States Navy
Production history
Manufacturer	Lockheed Missiles Division
Specifications
Weight	73,066 pounds (33,142 kg)
Length	33 feet (10.2 m)
Diameter	71 inches (1.8 m)
Warhead	thermonuclear weapon multiple independently targetable reentry vehicles (MIRV). Eight W76 (100 kt) warheads (Mark 4).
Engine	Solid-fuel rocket
Operational range	4,600 miles (7,400 km)
Guidance system	Astro-inertial guidance
Accuracy	CEP: 1250 ft (380 m)
Launch platform	Ballistic Missile Submarine

The UGM-96 Trident I, or Trident C4, was an American submarine-launched ballistic missile, built by Lockheed Martin Space Systems in Sunnyvale, California. First deployed in 1979, the Trident I replaced the Poseidon missile. It was retired in 2005, having been replaced by the Trident II. In 1980, the Royal Navy requested Trident I missiles under the Polaris Sales Agreement; in 1982, this was changed to Trident IIs. It was the first Trident missile to enter service.

The Trident I is a three-stage, solid-fuelled missile.

The first eight Ohio-class submarines were armed with Trident I missiles. Twelve James Madison- and Benjamin Franklin-class submarines were also retrofitted with Trident I missiles, which replaced older Poseidon missiles.