McKeever joined the
Queen's Own Rifles of Canada, a
militia unit, as a
private. He remained with them until November, 1916, when he was accepted into the
Royal Flying Corps. He sailed for England for training on 25 November 1916. He was commissioned a probationary lieutenant on 5 December. On 25 January 1918, both pilot and observer were withdrawn from combat and shipped home. Major McKeever joined fellow aces
William Bishop and
Raymond Collishaw in establishing the
Canadian Air Force. McKeever organized No 1 Squadron of the new air force, and served as its commanding officer. The war ended before the new squadron could take its
Sopwith Dolphins to battle. Canada's government then dissolved the fledgling air force. With war's end, McKeever accepted a job managing an airfield at
Mineola,
New York. Before he could start work, he was involved in an auto accident in his home town of Listowel. He broke his leg, complications set in, and he died of cerebral thrombosis on Christmas Day, 1919. ==Text of citations==