AGM-137 TSSAM

The Northrop AGM-137 TSSAM, the Tri-Service Standoff Attack Missile, was a stealthy stand-off cruise missile planned for all three branches of the United States armed forces, which explains the tri-service name. Development began in 1986. Revelations of cost overruns in 1991 led the Army to withdraw from the project, and an investigation of the procurement by the General Accounting Office followed. The program was cancelled in December 1994, on the GAO recommendation and after losing Army support, though it had gone as far as several test launches. The missile weighed about 2,000 pounds and was 168 inches long, with a 100 inch wingspan, a Williams F122-WR-100 turbofan engine and inertial navigation with GPS updates. It never entered service.