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