After serving with the 19th Reserve Battalion of the Canadian Expeditionary Force, Joseph Eskill Hallonquist, the son of John Hallonquist, was seconded to the Royal Flying Corps on 2 November 1917. In January 1918 he was posted to 28 Squadron in Italy. There he scored 5 victories flying the Sopwith Camel. On 29 October 1918, he was captured when his aircraft was shot down by anti-aircraft fire. He left the Royal Air Force on 2 December 1919.
Appears as Joseph Eskel Hallonquist in the London Gazette.
Distinguished Flying Cross (DFC)
Lieut. (Hon. Capt.) Joseph Eskel Hallonquist (19th Res. Bn., Canadians). (ITALY)
This officer at all times displays the highest skill and courage, setting a fine example to other pilots. He has accounted for five enemy machines, and, during the recent operations, has led four successful bombing patrols at low altitudes.