High Quality Content by WIKIPEDIA articles! USS Excel (AM-439) was an Aggressive-class minesweeper: laid down, 9 February 1953 as AM-439 at the Higgins Corp., New Orleans, Louisiana; launched, 25 September 1953; reclassified an Ocean Minesweeper (non-magnetic) MSO-439, 7 February 1955; commissioned USS Excel (MSO-439), 24 February 1955.