Trident and Typhoon submarines 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, 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 Trident II (D-5) missile, which entered service in 1990.Friedman, pp. 206–207Gardiner and Chumbley, p. 554 The entire class was converted to use Trident II by the early 2000s. Trident II offered a range of over with eight larger MIRV warheads than Trident I. When the 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. Eighteen Ohio-class boats were commissioned by 1997,Gardiner and Chumbley, p. 613 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 Project 941 Akula, famous as the Typhoon-class (and not to be confused with the 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 and 10 MIRV warheads. Six Typhoons were commissioned in 1981–89.
Trident and Typhoon submarines 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 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 Trident II (D-5) missile, which entered service in 1990.Friedman, pp. 206–207Gardiner and Chumbley, p. 554 The entire class was converted to use Trident II by the early 2000s. Trident II offered a range of over with eight larger MIRV warheads than Trident I. When the 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. Eighteen Ohio-class boats were commissioned by 1997,Gardiner and Chumbley, p. 613 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 Project 941 Akula, famous as the Typhoon-class (and not to be confused with the 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 and 10 MIRV warheads. Six Typhoons were commissioned in 1981–89.