After shakedown out of San Pedro, California, Jaguar departed 19 January 1944 for duty as a floating storage ship in the Pacific islands. She arrived New Caledonia on 21 February via Wellington, New Zealand, and from there she transported vital diesel oil, aviation gasoline, and minesweeping gear to the New Hebrides and Solomon Islands. Jaguar returned to the West Coast early in 1946 and arrived Norfolk, Virginia, via the Panama Canal on 20 April. She decommissioned there 10 June 1946, and was turned over to the Maritime Commission. After serving as a tanker with various American lines under the name of Harry Peer in 1948 and Tini in 1949, the ship was transferred to Panamanian flag in February 1951.