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SSM-N-9 Regulus II
The SSM-N-9 Regulus II cruise missile was a supersonic guided missile armed with a nuclear warhead, intended for launching from surface ships and submarines of the U.S. Navy (USN).〔Koch, Charles A. ("Regulus II cruise missile". ) ''Regulus II Cruise Missile. Retrieved: 6 January 2013.〕
==History==
The limitations of the Regulus I were well known by the time it entered service in 1955, so the Navy issued a specification for a surface-launched supersonic shipborne cruise missile, equipped to carry a nuclear warhead, that had greater range, accuracy and resistance to countermeasures.
Development of the Regulus II was well under way when the program was canceled in favor of the UGM-27 Polaris SLBM (Submarine-Launched Ballistic Missile) system, which gave unprecedented accuracy as well as allowing the launch submarine to stay submerged and covert. Prototype and initial production missiles were later converted to Vought KD2U-1 supersonic target drones for the U.S. Navy and the U.S. Air Force, which used the KD2U-1 during tests of the Boeing IM-99/CIM-10 Bomarc SAM (Surface to Air Missile).〔
Interestingly, the SSM-N-9a Regulus II was redesignated as the RGM-15A in June 1963, nearly five years after the missile program had been terminated. At the same time the KD2U-1 target drone was redesignated as the Vought MQM-15A. Some targets equipped with landing gear were redesignated as Vought GQM-15As.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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