alt Hacker NewsOpen a history book. They do a lot more than patrol the northern border. Canada was involved in WWI, WWII, Korea, Iraq 1 and 2, Fall of Yugoslavia, Afghanistan, Libyan civil war, Iraq civil war, Syrian civil war and ISIS conflict, Yemeni civil war, and a smattering of other conflicts over the past century.
Canada, as a commonwealth country, was involved in ww I and ww ii years before the us decided to get involved. Or more involved than selling arms.