The 562nd Air Defense Artillery Regiment was an air defense regiment of the United States Army. It was organized under the Combat Arms Regimental System.
21 AAA Battalion (AW)(SP) was constituted 5 September 1928 in the Organized Reserves as the 2nd Battalion, 562nd Coast Artillery Regiment (Antiaircraft). Redesignated as the 2nd Battalion, 917th Coast Artillery Regiment (Antiaircraft) and organized in Virginia on 30 November 1929. Allotted to the Regular Army, redesignated as the 2nd Battalion, 70th Coast Artillery Regiment (Antiaircraft) and activated at Fort Monroe, VA on 4 November 1939. During World War II, the 70th Coast Artillery landed on Guadalcanal with the XIV Corps on 23 May 1943. On 10 November 1943 the 70th Coast Artillery Regiment was reorganized and redesignated as the 70th Antiaircraft Artillery Group.
The Institute of Heraldry official records state that the regiment's distinctive unit insignia was originally approved for the 917th Coast Artillery Regiment on 7 August 1935. It was redesignated for the 70th Coast Artillery (AA) Regiment on 19 January 1940. It was redesignated for the 70th Antiaircraft Artillery Gun Battalion on 15 April 1946.
The Headquarters and Headquarters Battery, 70th Antiaircraft Artillery Group, and the 70th and 21st Antiaircraft Artillery Battalions consolidated, reorganized, and redesignated 31 July 1959 as the 562d Artillery, a parent regiment under the Combat Arms Regimental System. Redesignated I September 1971 as the 562d Air Defense Artillery.
Tim Aumiller's book lists deployments of battalions of the regiment as follows:
Also: