Hoare joined the Royal Naval Air Service and trained as an
air gunner, first serving on the
airship N.S.1, but was later posted to
No. 88 Squadron RFC. On 1 April 1918 the RNAS became part of the newly formed
Royal Air Force. Between June and August 1918 flying as a
Bristol F.2b observer/air gunner he was credited, along with his pilots Lieutenants Alec Williamson and C. Foster, with seven victories. He was wounded on 17 August 1918 and shot down and wounded again in October 1918, staying in hospital to the end of the war. In 1939 Hoare re-enlisted in the RAF, serving as
aircrew for a year before being discharged because of his age. He spent the rest of the war serving in the
ARP in
Forest Gate, East London. ==Honours and awards==