Later in 1944, he was sent to the British Air Commission Washington DC, where he tested various prototype aircraft and evaluated airborne radar equipment. He also served at the Naval Air Station Patuxent River, Maryland. By the end of the war, he was a lieutenant commander. In 1945, he attended No. 3 Course at the Empire Test Pilots' School (ETPS), then based at RAF Cranfield.The Empire Test Pilots' School — Twenty Five Years, 1968, p. 68 and then went to the Naval Squadron at the Aeroplane and Armament Experimental Establishment at Boscombe Down.
