SS Niantic Victory served as merchant marine naval supplying goods for the Korean War.

SS Niantic Victory made trip between 18 November 1950 and 23 December 1952 helping American forces engaged against Communist aggression in South Korea.

She was reassigned to the Military Sea Transportation Service (MSTS) for conversion to a Missile Range Instrumentation Ship.

[3] Niantic Victory was now the Navy Department Military Sea Transportation Service range instrumentation ship, USNS Watertown (T-AGM-6).

For the next 11 years, she served in the Pacific Ocean in support of the National Aeronautics and Space Administration and the U.S. Air Force on the latter service's Western Missile Test Range.

Her name was struck from the Navy Directory on 16 February 1972, and she was returned to the Maritime Administration at its berthing facility at Suisun Bay, California, on 23 May 1974.