A submarine-launched cruise missile (SLCM) is a cruise missile that is launched from a submarine (especially a SSG or SSGN). Current versions are typically standoff weapons which are used to attack predetermined land targets with conventional or nuclear payloads. Brahmos is the fastest missile currently developed. The previous US Navy cruise missile submarines (4 SSG and 1 SSGN) deployed with the Regulus missile from 1958 until retired in 1964 with the arrival of the Polaris missile submarines in the Pacific.