Camp Borden
Camp Borden was established during the First World War as a major training centre of Canadian Expeditionary Force battalions. The Camp (including this structure) was officially opened by Sir Sam Hughes, Minister of Militia and Defence, on July 11, 1916, after two months of intensive building. This military reserve, comprising over 5000 ha, was soon occupied by some 32,000 troops. Training facilities were expanded in 1917 with the institution of an air training program under the Royal Flying Corps, Canada, and the construction of the first Canadian military aerodrome, regarded as the finest military aviation camp in North America. Following the armistice Camp Borden continued as an important army and air force centre and became one of the largest armed forces bases in Canada.
Plaque via Alan L. Brown's site Ontario Plaques. Full page here.