She transferred her remaining ammunition to USS Shasta (AE-6) on 2 June and sailed to San Francisco where, at Mare Island Naval Shipyard on 9 August 1944, 328 African-American enlisted sailors refused to load munitions; a work-stoppage that was to be called the Port Chicago mutiny.

Between 15 and 21 September, she lay off the beach during the day issuing ammunition to American warships and retired seaward with the transports at night.

She then issued ammunition in Kossol Passage between 22 and 26 September and at Seeadler Harbor between 1 and 10 October before joining USS Mauna Loa (AE-8) and sailing to San Francisco.

She remained there until ordered back to Pearl Harbor on 12 August to be fitted as a tender for small minecraft, and sailed from there on 26 September with general cargo loaded for fleet issue.

She was struck from the Navy list on 1 July 1960, having been transferred the previous day to the National Defense Reserve Fleet at Beaumont, Texas Sangay was finally sold for scrapping on 19 November 1980.