The 103rd Armor Regiment is an armored regiment in the Pennsylvania National Guard first formed in 1941. Its legacy unit, 3rd Battalion, 103rd Armor, is a subordinate command of the 55th Heavy Brigade Combat Team, 28th Infantry Division. Lineage Constituted 3 December 1941 in the Army of the United States as the 628th Tank Destroyer Battalion. Activated 15 December 1941 at Indiantown Gap Military Reservation, Pennsylvania. Allotted 7 March 1942 to the Pennsylvania National Guard. Inactivated 14 November 1945 at Camp Myles Standish, Massachusetts. Redesignated 24 May 1946 as the 628th Tank Battalion. Organized and Federally recognized 2 May 1949 as the 628th Heavy Tank Battalion, with headquarters at Johnstown, and assigned to the 28th Infantry Division. Ordered into active Federal service 5 September 1950 at Johnstown. Reorganized and redesignated 20 September 1950 as the 628th Tank Battalion. (628th Tank Battalion [NGUS] organized and Federally recognized 6 September 1953 at Johnstown). Released from active Federal service 15 June 1954 and reverted to state control; Federal recognition concurrently withdrawn from the 628th Tank Battalion (NGUS). Consolidated 1 June 1959 with elements of the 110th Infantry and the 108th and 166th Field Artillery Battalions to form the 103d Armor, a parent regiment under the Combat Arms Regimental System, to consist of the 1st Reconnaissance Squadron and the 2d Medium Tank Battalion, elements of the 28th Infantry Division. Reorganized 1 May 1962 to consist of the 1st Reconnaissance Squadron and the 2d Medium Tank Battalion, elements of the 28th Infantry Division, and the 3d Medium Tank Battalion. Reorganized 1 April 1963 to consist of the 1st and 2d Battalions, elements of the 28th Infantry Division, and the 3d Medium Tank Battalion. Reorganized 24 March 1964 to consist of the 1st and 2d Battalions, elements of the 28th Infantry Division, and the 3d Battalion. Reorganized 17 February 1968 to consist of the 1st Battalion, an element of the 28th Infantry Division, and the 3d Battalion. Reorganized 1 January 1976 to consist of the 1st Battalion, an element of the 28th Infantry Division. Withdrawn 5 April 1988 from the Combat Arms Regimental System and reorganized under the United States Army Regimental System. Reorganized 1 March 1992 to consist of the 1st and 2d Battalions, elements of the 28th Infantry Division. Reorganized 1 October 1995 to consist of the 1st, 2d, and 3d Battalions, elements of the 28th Infantry Division. Ordered into Federal service 24 July