According to Wikipedia (which is always accurate .... NOT) the Canadian forces did not exist as a unit but was made up of assigned personnel to form the 1st Canadian Parachute Battalion but this unit never officially existed either. The tartan in the film is unlikely to belong to this unit but a tartan would have been selected for the film. As it was a freshly made up unit it is also unlikely that at that time it would have had its own band unless those assigned were already bandsmen in their previous units.