World War I The 73rd Field Artillery Regiment was originally organized in October 1918 in the
Regular Army at
Camp Jackson,
South Carolina, as an element of the 22nd Field Artillery Brigade, the latter organized the previous month at
Camp George G. Meade,
Maryland. However, the brigade headquarters was demobilized at Camp Meade during October, followed by the 73rd Field Artillery on 28 December at Camp Jackson.
Interwar period The 73rd Field Artillery was reconstituted in the Regular Army on 1 October 1933, assigned to the 23rd Field Artillery Brigade (General Headquarters Reserve), and allotted to the Second
Corps Area. It was organized in 1934 with
Organized Reserve personnel as a "Regular Army Inactive" (RAI) unit with headquarters at
Newark,
New Jersey. It was inactivated by March 1937 at Newark by relief of Reserve personnel. It was redesignated the 73rd Field Artillery Battalion on 13 January 1941.
World War II On 15 March 1942, the battalion was ordered into active service at
Fort Riley,
Kansas, and organized as a separate truck-drawn
105 mm howitzer battalion. It was assigned to the
9th Armored Division on 15 July 1942, being converted into an
armored field artillery battalion. The battalion departed the
New York Port of Embarkation on 20 August 1944 and returned to the United States on 9 October 1945 via the Hampton Roads Port of Embarkation,
Virginia, being inactivated there the same day.
Cold War Parts of the regiment were based in West Germany between 1963 and 1975. The 4th Battalion, 73rd Artillery was deployed to help suppress the
April 1968 Baltimore riots. ==Distinctive unit insignia==