A classified program begun in 1982 to determine the technical feasibility of a military aerospace plane. Requirements were for a sled-launched horizontal-takeoff / horizontal-landing single stage to orbit (SSTO) launch vehicle powered by a modified SSME with a two-position nozzle. Dry mass was to be 100,000-150,000 lb, takeoff mass 1,2-1,5 million lb with a 10,000 lb payload to a polar orbit from Grand Forks AFB. AMSC concepts from Boeing, Lockheed and McDonnell Douglas were hand-picked for further development with Rocketdyne and Air Products as propulsion contractors. The Boeing concept was apparently their RASV vehicle. The McDonnell Douglas proposal, possibly GRM-29A, had a down- pointing SSME in the nose to cater for the runway requirements, whereas Lockheed used a ramped takeoff with two solid boosters. By 1984 it had become clear that horizontal takeoff was inappropriate use of rocket power, and the program was superseded by Science Realm.