 After American entry into World War II, the 152d Observation Squadron immediately took up its primary mission of anti-submarine patrols along the Northeastern shipping lanes.In September 1944 the unit, now designated the 37th Photographic Reconnaissance Squadron, transferred overseas.Assigned to the Fifteenth Air Force, squadron pilots flew Photo Reconnaissance missions in northern Italy, southern Germany and the Balkans until the end of the war in Europe in June 1945.