High Quality Content by WIKIPEDIA articles! USS Sandpiper (AM-51) was a Lapwing-class minesweeper. Laid down on 15 November 1918 at the Philadelphia Navy Yard, Philadelphia, Pennsylvania, and launched on 28 April 1919, USS Sandpiper (Minesweeper No.51) was commissioned on 9 October 1919, redesignated AM-51 on 17 February 1920, and reclassified as a Small Seaplane Tender, AVP-9 on 22 January 1936.