The distinctive unit insignia was originally approved for the 6th Coast Artillery on 20 May 1924. It was redesignated for the 6th Coast Artillery Battalion on 26 Feb 1945. On 8 Mar 1951 the insignia was redesignated for the 6th Antiaircraft Artillery Automatic Weapons Battalion. The insignia was cancelled on 15 May 1959. The distinctive unit insignia was reinstated on 1 Sep 1971 for the 6th Air Defense Artillery.