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This category includes exchanges of notes and formal agreements between Canada and the United States related to defence cooperation, aerospace warning and control, military operations, and shared defence infrastructure. The documents cover subjects such as amendments and extensions to the NORAD Agreement, reciprocal weapons‑system testing, joint undersea surveillance facilities, cooperative activities between military services, and the continued operation of specialized testing ranges. These agreements support coordinated defence planning, interoperability, and long‑standing binational security arrangements.