The C4 and D5 designations put the missiles within the "family" that started in 1960 with Polaris (A1, A2 and A3) and continued with the 1971 Poseidon (C3).
Trident II (designated D5) had the objective of improved circular error probable (CEP), or accuracy, and was first deployed in 1990, and was planned to be in service for the thirty-year life of the submarines, until 2027. Trident missiles are provided to the United Kingdom under the terms of the 1963 Polaris Sales Agreement which was modified in 1982 for Trident.
The missile is named after the mythological trident of Neptune. ==Development== In 1971, the US Navy began studies of an advanced Undersea Long-range Missile System (ULMS).
A Decision Coordinating Paper (DCP) for the ULMS was approved on 14 September 1971.
The C4 and D5 designations put the missiles within the "family" that started in 1960 with Polaris (A1, A2 and A3) and continued with the 1971 Poseidon (C3).
The ULMS II missile system was designed to be retrofitted to the existing SSBNs, while also being fitted to the proposed . In May 1972, the term ULMS II was replaced with Trident.
In addition to a longer-range missile, a larger submarine was proposed to replace the , and -class SSBNs in 1978.
The Trident was to be a larger, higher-performance missile with a range capacity greater than 6000 mi. Trident I (designated as C4) was deployed in 1979 and retired in 2005.
British Prime Minister Margaret Thatcher wrote to President Carter on 10 July 1980, to request that he approve supply of Trident I missiles.
Trident II (designated D5) had the objective of improved circular error probable (CEP), or accuracy, and was first deployed in 1990, and was planned to be in service for the thirty-year life of the submarines, until 2027. Trident missiles are provided to the United Kingdom under the terms of the 1963 Polaris Sales Agreement which was modified in 1982 for Trident.
However, in 1982 Thatcher wrote to President Reagan to request the United Kingdom be allowed to procure the Trident II system, the procurement of which had been accelerated by the US Navy.
This was agreed upon in March 1982.
There have been 172 successful test flights of the D5 missile since design completion in 1989, the most recent being from in May 2019.
Trident II (designated D5) had the objective of improved circular error probable (CEP), or accuracy, and was first deployed in 1990, and was planned to be in service for the thirty-year life of the submarines, until 2027. Trident missiles are provided to the United Kingdom under the terms of the 1963 Polaris Sales Agreement which was modified in 1982 for Trident.
The pool is 'co-mingled' and missiles are selected at random for loading on to either nation's submarines. ===D5LE (D5 Life Extension Program)=== In 2002, the United States Navy announced plans to extend the life of the submarines and the D5 missiles to the year 2040.
The Trident was to be a larger, higher-performance missile with a range capacity greater than 6000 mi. Trident I (designated as C4) was deployed in 1979 and retired in 2005.
Then-British Prime Minister Tony Blair outlined plans in Parliament on 4 December 2006 to build a new generation of submarines (Dreadnought-class) to carry existing Trident missiles, and join the D5LE project to refurbish them. The first flight test of a D-5 LE subsystem, the MK 6 Mod 1 guidance system, in Demonstration and Shakedown Operation (DASO)-23, took place on on 22 February 2012.
provoke a full-scale counterattack using strategic nuclear forces," Putin said in May 2006. ==Operators== ==See also== Agni-VI British Trident system ICBM JL-1 JL-2 K Missile family M45 (missile) M51 (missile) Nuclear weapons and the United Kingdom Nuclear weapons and the United States R-29RMU2.1 "Layner" RSM-56 Bulava ==References== ==External links== Basic characteristics of Trident II D-5 at the U.S.
In 2007, Lockheed Martin was awarded a total of $848 million in contracts to perform this and related work, which also includes upgrading the missiles' reentry systems.
Then-British Prime Minister Tony Blair outlined plans in Parliament on 4 December 2006 to build a new generation of submarines (Dreadnought-class) to carry existing Trident missiles, and join the D5LE project to refurbish them. The first flight test of a D-5 LE subsystem, the MK 6 Mod 1 guidance system, in Demonstration and Shakedown Operation (DASO)-23, took place on on 22 February 2012.
There have been fewer than 10 test flights that were failures, the most recent being from , one of Britain's four nuclear-armed submarines, off the coast of Florida in June 2016. The Royal Navy operates their missiles from a shared pool, together with the Atlantic squadron of the U.S. Navy Ohio-class SSBNs at King's Bay, Georgia.
There have been 172 successful test flights of the D5 missile since design completion in 1989, the most recent being from in May 2019.
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