CGC Spencer vs. U-175, 1943
Official Caption: "COAST GUARD CUTTER SINKS SUB: Sailors aboard the U.S. Coast Guard Cutter SPENCER watch a K-Gun go into action following detection of a submarine below [the] surface. This is the opening round of a battle in which the sub is blown to the surface, where it is engaged by Coast Guardsmen protecting a large Atlantic convoy." Date: 17 April 1943; Photo No.: 1515 Photographer: Jack January Source - NARA