Canada was a founding member of the North Atlantic Treaty Organization (NATO) in 1949, the North American Aerospace Defence Command (NORAD) in 1958, and played a leading role in United Nations peacekeeping operations—from the Korean War to the creation of a permanent UN peacekeeping force during the Suez Crisis in 1956. Subsequent peacekeeping interventions occurred in the Congo (1960), Cyprus (1964), the Sinai (1973), Vietnam (with the International Control Commission), Golan Heights, Lebanon (1978), and Namibia (1989–1990).

Canada did not follow the American lead in all Cold War actions, sometimes resulting in tensions between the two countries. For instance, Canada refused to join the Vietnam War; in 1984, the last nuclear weapons based in Canada were removed; diplomatic relations were maintained with Cuba; and the Canadian government recognized the People's Republic of China before the United States.

The Canadian military maintained a standing presence in Western Europe as part of its NATO deployment at several bases in Germany—including long tenures at CFB Baden-Soellingen and CFB Lahr, in the Black Forest region of West Germany. Also, Canadian military facilities were maintained in Bermuda, France, and the United Kingdom. From the early 1960s until the 1980s, Canada maintained weapon platforms armed with nuclear weapons—including nuclear-tipped air-to-air rockets, surface-to-air missiles, and high-yield gravity bombs principally deployed in the Western European theatre of operations as well as in Canada.