"Fox" departed San Diego 22 September 1944, and arrived at the Puget Sound Navy Yard for conversion to a miscellaneous auxiliary on 26 September. She was re-classified AG-85 on 1 October. On 4 November, the ship proceeded to Seattle and, after engaging in scheduled exercises, on the 8th got underway for San Francisco. She arrived at Naval Air Station Alameda on the 11th, and reported for duty to Commander Fleet Air. From November through September 1945, "Fox" was based on Alameda, engaging in plane exercises and serving as target vessel in aerial torpedo exercises in the Monterey area. She departed San Francisco Bay on 18 October 1945 for the U.S. East Coast, arriving Norfolk, Virginia, on 7 November. "Fox" was decommissioned 29 November 1945 at the Norfolk Navy Yard, Portsmouth, Virginia. She was sold for scrapping 12 November 1946.