by 
National Peacekeepers’ Day is an official remembrance day for Canadian veterans of military peacekeeping activities. It is officially marked on 9 August of each year and alternately may be observed on the closest Sunday
The date was chosen to commemorate 9 August 1974, when nine Canadian peacekeepers serving on UNEF II were killed when their aircraft was shot down over Syria, the highest number of Canadian peacekeepers killed in a single incident.
