| 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 | War of 1812 Indian Wars Mexican War American Civil War World War II Vietnam War Grenada Southwest Asia |
| Commanders | |
| Current commander | LTC James L. Watson |
| Notable commanders | Lt. Stephen H. Weed Lt. Bayard Wilkeson |
| 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 Coast and Field Artillery units, the Regiment was broken up 13 February 1901, and its elements reorganized and redesignated as separate numbered companies and batteries of the Artillery Corps.[1]