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.
USAT McClellan USAT "McClellan" was a United States Army transport ship that saw service during the Spanish–American War and World War I. She also participated in the occupation of Veracruz in 1914.