Weapons delivery platform project undertaken by the United States in the 1950s The Supersonic Low Altitude Missile or SLAM was a U.S. Air Force nuclear weapons project conceived around 1955, and cancelled in 1964. SLAMs were conceived of as unmanned nuclear-powered ramjets capable of delivering thermonuclear warheads deep into enemy territory. The development of ICBMs in the 1950s rendered the concept of SLAMs obsolete. Advances in defensive ground radar also made the stratagem of low-altitude evasion ineffective. Although it never proceeded beyond the initial design and testing phase before being declared obsolete, the design contained several radical innovations as a nuclear delivery system. 576,734 views on January 10, 2016 — Wikipedia's most-read article that day. Also most read: Bruce Kingsbury, Pepper Ann, Steven Avery, The Revenant (2015 film). Wiki link