1/514th CAR (AA) became 217th Coast Artillery Battalion on 20 January 1943, and was again redesignated as 217th Anti Aircraft Artillery Battalion on 28 June 1943. The 217th deployed from the Boston Port of Embarkation on 7 April 1944 and arrived in England on 17 April 1944. The 217th moved forward to France on 25 June 1944, where they remained until they moved forward to participate in the Ardennes-Alsace Offensive. The 217th was relocated to Stubenag, Germany on 20 August 1945. The 217th returned to the continental US via the Hampton Roads Port of Embarkation on 2 February 1946, and was deactivated and returned to the US Army Reserve the same day.