Interdictor (YAGR-13) was laid down on 18 May 1945, under a Maritime Commission (MARCOM) contract, MC hull 3142, as the Liberty ship Edwin H. Duff, by J.A.

She was launched 29 June 1945; sponsored by Mrs. Edwin S. Duff; and delivered 27 July 1945, to the McCormack Steamship Co.[3][5] She carried aircraft until entering the James River Reserve Fleet, Lee Hall, Virginia, 17 October 1945.

[3][5] Fitted with the latest and best electronic search and tracking equipment, Interdictor sailed 2 May 1958, for shakedown training in the Caribbean.

She departed Charleston, 18 July 1958, and sailed to her new home port, San Francisco, California.

She continued on radar picket patrols for the Continental Air Defense Command (CONAD) out of San Francisco, until decommissioned 5 August 1965.