USS APc-21
 USS APc-21 was a United States Navy APc-1-class small coastal transport vessel in World War II. Laid down on 24 May 1942 as Coastal Minesweeper AMc-173 at Hodgdon Brothers Goudy and Stevens East Boothbay Maine she was launched on 2 September 1942 and commissioned as APc-21 on 27 February 1943.She sailed from Maine to Brisbane Australia and served with the Seventh Fleet Amphibious Force in the South West Pacific Area conducting operations off the coast of New Guinea.