During the June 6, 1944 invasion of Normandy he directed the landings on Utah Beach from the attack transport . For three weeks the "Bayfield" was in position off Utah beach and officers and men were on four hour rotating shifts for this entire time. Shortly afterwards the "Bayfield" was sent to Naples for the invasion of Southern France. However, on August 5, 1944, Moon shot himself with his .45 caliber pistol. His suicide was blamed on battle fatigue. He was posthumously decorated with Legion of Honour by the Government of France.