 It converted and was redesignated on 20 September 1940 as Battery E, 210th Coast Artillery, and subsequently relieved from assignment to the 22nd Cavalry Division.It was inducted into Federal service on 24 February 1941 at Detroit before being reorganized and redesignated on 14 February 1944 as Battery A, 593rd Antiaircraft Artillery Automatic Weapons Battalion.It inactivated on 1 November 1944 at Camp Howze, Texas.