Modifications to the guidance system, electronics hardening, and external protective coatings were incorporated into the design. It was established that the Trident II would be 83 inches (210 cm) in diameter and 44 feet (13 m) in length in order to match the performance of the existing MX ICBM. Navy conducted studies to determine whether the more expensive Trident II could be constructed similarly to the US Air Force's MX ICBM, primarily to decrease budget costs. The second requirement asked for an alternative to the C-4, or a new Trident II missile with a larger first-stage motor than the C-4. The first was an accuracy improvement for the Trident C-4. On 14 March 1974, the US Deputy Secretary of Defense disseminated two requirements for the Trident program. On 18 October 1973, a Trident program review was administered. The US Navy shifted the IOC date to 1982. ![]() In 1972, the US Navy projected an initial operating capability (IOC) date of 1984. The Trident II was designed with greater range and payload capacity than its predecessor ( Trident C-4). History USS Kentucky firing a Trident II SLBM in 2015 as part of the DASO 26 test launch The Trident D5LE (life-extension) version will remain in service until 2042. The D5 is the sixth in a series of missile generations deployed since the sea-based deterrent program began 60 years ago. There have been fewer than 10 test flights that were failures, the most recent being from HMS Vengeance off the coast of Florida in June 2016. There have been 177 successful test flights of the D5 missile since design completion in 1989, the most recent being from USS Maine (SSBN-741) in February 2020. Trident II missiles are carried by 14 US Ohio and 4 British Vanguard-class submarines, with 24 missiles on each Ohio class and 16 missiles on each Vanguard class (the number of missiles on Ohio-class submarines was reduced to 20, by 2017, in compliance with the New Strategic Arms Reduction Treaty). The Trident II's increased payload allows nuclear deterrence to be accomplished with fewer submarines, and its high accuracy-approaching that of land-based missiles-enables it to be used as a first strike weapon. ![]() It has payload flexibility that can accommodate various treaty requirements, such as New START. The Trident II is considered to be a durable sea-based system capable of engaging many targets. strategic nuclear triad and strengthens U.S. The Trident II Strategic Weapons System is an improved SLBM with greater accuracy, payload, and range than the earlier Trident C-4. It was first deployed in March 1990, and remains in service. The UGM-133A Trident II, or Trident D5 is a submarine-launched ballistic missile (SLBM), built by Lockheed Martin Space in Sunnyvale, California, and deployed with the United States and Royal Navy.
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