From 7 February to 27 March 1952, Marine Fiddler was activated and operated by American President Lines for the Maritime Administration before returning to the Reserve Fleet at Suisun Bay.

The ship, under control of MSTS Pacific, provided support for American and U.N. forces in Korea combating Communist aggression.

Converted to a heavy lift cargo ship 29 March 1954, she saw worldwide service, carrying oversized and bulky equipment in her special holds.

When U.S. forces left France in early 1967, Marine Fiddler, with other MSTS ships, transported heavy equipment to other bases in Europe.

The ship would continue to serve the Asia-Pacific region for 3 more years before finally being brought out of service on 14 July 1973 for layup in the James River National Defense Reserve Fleet in Lee Hall, Virginia.