Columbia subject headings:
Canada--Defenses.
Canada--Military relations--United States.
North America--Defenses.
United States--Military policy.
United States--Military relations--Canada.
Harvard subject headings:
Canada--Defenses.
Canada--Military relations--United States.
North America--Defenses.
United States--Military policy.
United States--Military relations--Canada.
Princeton subject headings:
Canada--Defenses.
Canada--Military relations--United States.
North America--Defenses.
United States--Military policy.
United States--Military relations--Canada.