It was followed by Trident I in 1979, and Trident II in 1990. ==Development== A development study for a longer range version of the Polaris missile—achieved by enlarging it to the maximum possible size allowed by existing launch tubes—started in 1963.
The main rocket motor ignited automatically when the missile had risen approximately above the submarine. The first test launch took place on 16 August 1968, the first successful at-sea launch was from a surface ship, the (from July 1 to December 16, 1969), earning the ship the Meritorious Unit Commendation, and the first test launch from a submarine took place on the on 3 August 1970.
The main rocket motor ignited automatically when the missile had risen approximately above the submarine. The first test launch took place on 16 August 1968, the first successful at-sea launch was from a surface ship, the (from July 1 to December 16, 1969), earning the ship the Meritorious Unit Commendation, and the first test launch from a submarine took place on the on 3 August 1970.
The main rocket motor ignited automatically when the missile had risen approximately above the submarine. The first test launch took place on 16 August 1968, the first successful at-sea launch was from a surface ship, the (from July 1 to December 16, 1969), earning the ship the Meritorious Unit Commendation, and the first test launch from a submarine took place on the on 3 August 1970.
It eventually equipped 31 -, -, and -class submarines. The Royal Navy also considered adopting Poseidon in the 1970s as an upgrade to its Polaris A3T boats, and like the US this would have kept the existing hulls.
The weapon officially entered service on 31 March 1971.
It succeeded the UGM-27 Polaris beginning in 1972, bringing major advances in warheads and accuracy.
It was followed by Trident I in 1979, and Trident II in 1990. ==Development== A development study for a longer range version of the Polaris missile—achieved by enlarging it to the maximum possible size allowed by existing launch tubes—started in 1963.
Although the Navy's favoured option, the British government instead adopted Chevaline, a two warhead MRV system with decoys, on the existing Polaris airframes and later moved to the Trident D5 in new boats. Beginning in 1979, 12 Poseidon-equipped SSBNs were refitted with Trident I.
It was followed by Trident I in 1979, and Trident II in 1990. ==Development== A development study for a longer range version of the Polaris missile—achieved by enlarging it to the maximum possible size allowed by existing launch tubes—started in 1963.
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