Dominion Day 1962 -- Canada's 95th birthday -- and holiday-makers throng Parliament Hill's vivid green. Softly, then louder, staccato double-beats of drums and clear, piercing notes of military brass are heard high above the capital city's traffic. To the waiting vacationers from across Canada, U.S.A. and overseas they herald the approach of the Canadian Guards. Headed by drum major with ornate mace comes the massed regimental band, pipes and drains, ranks of scarlet-coated, bear-skinned guardsmen -- row upon row -- marching at a measured tread of one hundred and sixteen 30-inch paces per minute. Wheeling through the main gate the full blare of martial music rings back from grey-stone government blocks -- makes even the Peace Tower seem more ramrod stiff at attention. The Dominion Day Troop of the Queen's Colour before the Governor General preludes two months of daily Changing the Guard -- a spectacle of colour for three quarters of a million visitors to Ottawa, a reminder to Canadians of their proud national heritage.