UGM-96 Trident I

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UGM-96 Trident I
Trident C4 first launch.jpg
The first launch of a Trident I, from Cape Canaveral, on 18 January 1977.
Function SLBM
Manufacturer Lockheed Martin Space Systems
Height 10.2 metres (33 ft)
Diameter 1.8 metres (71 in)
Mass 33,142 kilograms (73,066 lb)
Stages 3
Launch history
Status Retired
Launch sites LC-25C, Cape Canaveral
Ohio-class submarines
James Madison-class submarines
Benjamin Franklin-class submarines
Total launches 168[1]
Successes 161
Failures 7
First flight 1977-01-18[1]
Last flight 2001-12-18[1]

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 It was retired in 2005,[2] having been replaced by the Trident II. In 1980, the Royal Navy requested Trident I missiles under the Polaris Sales Agreement, however 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.


Diagramatic view of a Trident II D5 missile

See also[edit]


  1. ^ a b c Wade, Mark. "Trident". Encyclopedia Astronautica. Retrieved 2008-11-22. 
  2. ^ Popejoy, Mary (November 5, 2005). "USS Alabama Offloads Last of C4 Trident Missiles". US Navy. Retrieved May 16, 2012. 
  3. ^ Parsch, Andreas. "UGM-133". Directory of U.S. Military Rockets and Missiles. Retrieved 2009-02-14.