High Quality Content by WIKIPEDIA articles! Captain Robert M. Losey (May 27, 1908 ? April 21, 1940), an aeronautical meteorologist, is considered to be the first American military casualty in World War II. While serving as a military attaché prior to America's entry into the war, Losey was killed on April 21, 1940 during a German bombardment in Norway. He had been attempting to complete the evacuation of the American diplomatic legation from Norway to Sweden in the wake of the German invasion.