Editing Submarine-launched ballistic missile (section)

===Trident and Typhoon submarines===
[[File:Trident II missile cropped.jpg|right|thumb|A [[Trident II missile]] just after launch.]]
Both the United States and the Soviet Union commissioned larger SSBNs designed for new missiles in 1981. The American large SSBN was the [[Ohio-class submarine|''Ohio'' class]], also called the "Trident submarine", with the largest SSBN armament ever of 24 missiles, initially Trident I but built with much larger tubes for the [[UGM-133 Trident II|Trident II (D-5) missile]], which entered service in 1990.<ref>Friedman, pp. 206–207</ref><ref>Gardiner and Chumbley, p. 554</ref> The entire class was converted to use Trident II by the early 2000s. Trident II offered a range of over {{convert|8000|km|nmi}} with eight larger MIRV warheads than Trident I. When the {{USS|Ohio|SSBN-726}} commenced sea trials in 1980, two of the first ten US SSBNs had their missiles removed to comply with SALT treaty requirements; the remaining eight were converted to attack submarines (SSN) by the end of 1982. These were all in the Pacific, and the Guam SSBN base was disestablished; the first several ''Ohio''-class boats used new Trident facilities at [[Naval Submarine Base Bangor]], [[Washington (state)|Washington]]. Eighteen ''Ohio''-class boats were commissioned by 1997,<ref>Gardiner and Chumbley, p. 613</ref> four of which were converted as cruise missile submarines (SSGN) in the 2000s to comply with [[START I]] treaty requirements. The Soviet large SSBN was the [[Typhoon-class submarine|Project 941 Akula]], famous as the Typhoon-class (and not to be confused with the [[Akula-class submarine|Project 971 Shchuka]] [[attack submarine]], called "Akula" by NATO). The Typhoons were the largest submarines ever built at 48,000 tons submerged. They were armed with 20 of the new [[R-39 Rif]] (SS-N-20) missiles with a range of {{convert|8300|km|nmi}} and 10 MIRV warheads. Six Typhoons were commissioned in 1981–89.<ref>{{cite web|url=http://russianships.info/eng/submarines/project_941.htm|title=Nuclear-powered ballistic missile submarines – Project 941|website=russianships.info}}</ref>