What was the duration of the war that was in progress when the USS McAnn first served in the Atlantic Ocean?
USS McAnn USS "McAnn" (DE-179) was a "Cannon"-class destroyer escort built for the United States Navy during World War II. She served in the Atlantic Ocean and provided escort service against submarine and air attack for Navy vessels and convoys.
USS West Haven (ID-2159) USS "West Haven" (ID-2159) was a steel–hulled freighter that saw service with the U.S. Navy during World War I, and which later saw convoy service during the Battle of the Atlantic in World War II.