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The Ceremonial Guard is an ad hoc military unit in the Canadian Armed Forces with elements drawn from two militia regiments of Foot Guards: The Governor General's Foot Guards from Ottawa and the Canadian Grenadier Guards from Montreal. Every summer, the Ceremonial Guard performs the Changing of the Guard ceremony on Parliament Hill and posts sentries at Rideau Hall, the residence of the Governor General of Canada.
Apart from ceremonial duties, the unit also provides military training under which members must pass basic military and infantry courses in order to become qualified guardsmen. The Ceremonial Guard also maintains its own regimental band and pipers. Musicians are drawn from military units and colleges or universities from across Canada and applicants must first pass an audition to be considered.
Apart from the Changing of the Guard, the Ceremonial Guard also takes part in the Canada Day celebration on 1 July as well as the Sunset Ceremony that takes place in the summer in Ottawa. The Ceremonial Guard is dissolved by the end of the summer tourist season and members are posted back to their corresponding units in Montreal and Ottawa. The unit is reformed again prior to the following year's summer.
The Ceremonial Guard maintains no Regimental Colour nor battle honour of its own as it is not a permanent unit in the Canadian Forces' order of battle. The only colours flown in the ceremonies are those of the two regiments involved.
http://en.wikipedia.org/wiki/Ceremonial_Guard