Army Nuclear Power Program

The Army Nuclear Power Program (ANPP) was a program of the United States Army to develop small pressurized water and boiling water nuclear power reactors for use in remote sites.

Eight reactors were built in all:

SM-1, 2 MWe. Fort Belvoir, VA, first criticality 1957 (several months before the Shippingport Reactor) and the first U.S. nuclear power plant to be connected to an electrical grid.
SM-1A, 2 MWe, plus heating. Fort Greely, Alaska. First criticality 1962.
PM-2A, 2 MWe, plus heating. Camp Century, Greenland. First criticality 1961.
PM-1, 1.25 MWe, plus heating. Sundance, Wyoming. Owned by the Air Force, used to power a radar station. First criticality 1962.
PM-3A, 1.75 MWe, plus heating. McMurdo Station, Antarctica. Owned by the Navy. First criticality 1962, decommissioned 1972.
MH-1A, 10 MWe, plus fresh water supply to the adjacent base. Mounted on the Sturgis, a barge converted from a Liberty ship, and moored in the Panama Canal Zone. Installed 1968, removed on cessation of US zone ownership in 1976 (the last of the eight to permanently cease operation).
SL-1, BWR, 200kWe, plus heating. Idaho Reactor Testing Station. First criticality 1958. Site of the only fatal accident at a US nuclear power reactor, on January 3, 1961, which destroyed the reactor.
ML-1, first closed cycle gas turbine. Designed for 300 kW, but only achieved 140 kW. Operated for only a few hundred hours of testing before being shut down in 1963.