 He remained in the USA, and when the U.S. entered the war he joined the United States Army Air Forces.He served the last years of the war in the U.S. Air Transport Headquarters, where he sang very little.After demobilization, Boyce decided to base his home and career in London starting with two recitals at Wigmore Hall in 1946, after which he was soon re-established as a recitalist and oratorio singer.