In addition, she made five voyages from the west coast to Pearl Harbor, seven to Manila, and one to Shanghai, as well as carrying men, ammunition and supplies to Marines in Nicaragua from 1928 to 1930.

She operated from Belfast, Plymouth, and Roseneath, Scotland, supplying battleships with the heavy projectiles fired during the Normandy landings.

On 25 July 1944, Nitro arrived in Mers-el-Kebir, Algeria, for similar duty in the invasion of southern France, serving there and at Algiers and Corsica until 28 September, when she sailed for the Panama Canal and Pearl Harbor.

Nitro returned to Puget Sound 15 August, repaired at Portland, Oregon, then sailed for the Panama Canal and Norfolk, arriving 28 October to decommission 30 November.

Transferred to the Maritime Commission 30 March 1948, Nitro was sold to National Bulk Carriers of New York City on 19 September 1949.