US 1st Coast Artillery Battalion reconstituted 21 June 1950 in the Regular Army as the 1st Coast Artillery Regiment to consist of the 1st and 2d Battalions; 1st and 2d Battalions concurrently redesignated as the US 1st Antiaircraft Artillery Battalion and US 54th Antiaircraft Artillery Battalions, respectively.
1st Antiaircraft Battalion redesignated 17 March 1955 as the 1st Antiaircraft Artillery Battalion (Missle) Activated 15 April 1955 at Irwin, Pennsylvania Inactivated 1 September 1958 at Irwin, Pennsylvania