4th U.S. Artillery
| 4th Air Defense Artillery Regiment | |
|---|---|
 |
|
| Active | 1821 – present |
| Country | USA |
| Branch | Army |
| Type | Air defense artillery |
| Motto(s) | "Nulli Vestigia Retrorsum" (No Step Backward) |
| Engagements | Battle of Egan Station |
| Commanders | |
| Notable commanders |
Lt. Stephen H. Weed |
| Insignia | |
| Distinctive unit insignia |  |
The 4th Air Defense Artillery Regiment was constituted 1 June 1821 in the Regular Army as the 4th Regiment of Artillery and organized from new and existing units with headquarters at Pensacola, Florida. As a result of the division of the Artillery Corps into the Coast and Field Artillery Corps, the Regiment was broken up 13 February 1901, and its elements reorganized and redesignated as separate numbered companies and batteries of the Artillery Corps.
Constituted 1 June 1821 in the Regular Army as the 4th Regiment of Artillery and organized from new and existing units with headquarters at Pensacola, Florida. B Battery, 4th Artillery was part of the Union Army's crack Iron Brigade in the Army of the Potomac during the Civil War.
Regiment broken up 13 February 1901 and its elements reorganized and redesignated as separate numbered companies and batteries of Artillery Corps
The regiment was reconstituted on the 1 July 1924 in the Regular Army as the 4th Coast Artillery Regiment. As a result of inter-war reductions in military appropriations, the following reductions and increases in the force levels affected this regiment:
The Regiment (less Headquarters and Headquarters Battery) was disbanded 3 October 1944 in the Canal Zone. Afterwards, the regiment underwent more changes with its Headquarters and Headquarters Battery, 4th Coast Artillery Regiment, reorganized and redesignated 1 November 1944 as Headquarters and Headquarters Battery, 4th Coast Artillery Group. The remainder of the regimental assets were used to organize the 4th Coast Artillery Battalion.
As the 4th Coast artillery Battalion, it was reorganized and redesignated 2 January 1945 as Headquarters and Headquarters Battery, Harbor Defenses of Balboa, but was inactivated on 15 January 1947 at Fort Amador, Canal Zone.
Consolidated again on 28 June 1950 with Headquarters and Headquarters Battery, as the 4th Antiaircraft Artillery Group (see below), the regiment was again consolidated as a unit and designated as the Headquarters and Headquarters Battery, 4th Antiaircraft Artillery Group activated 1 September 1951 at Ladd Air Force Base, Alaska, and inactivated 15 January 1958 at Ladd Air Force Base, Alaska
Under the Combat Arms Regimental System (CARS) the Headquarters and Headquarters Battery, 4th Antiaircraft Artillery Group was consolidated and reorganized to include:
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