The North Warning System is a joint United States and Canadian early-warning radar system for the atmospheric air defense of North America. It provides surveillance of airspace from potential incursions or attacks from across North America's polar region. It replaced the Distant Early Warning Line system in the late 1980s.
An old map of the chain of radar sites within the North Warning System rests on a wall at Ottawa, Canada, Jan. 14, 2025.
The support agreement for the North Warning System between Canada and the United States sits in a glass case at Ottawa, Canada, Jan. 14, 2025.
The U.S. Air Force Air Combat Command Acquisition Management and Integration Center Detachment 1 team walks through the Arctic tundra inspecting the operational readiness of the North Warning System Site FOX-M Hall Beach, Sanirajak, Nunavut, Canada
U.S. Air Force Air Combat Command Acquisition Management and Integration Center Detachment 1 team members and other USAF personnel walk up to North Warning System Site CAM-5A, Cape McLoughlin, Northwest Territories, Canada, April 9, 2025.
A helicopter lands at Hall Beach Radar Station during a refueling mission for the North Warning System at Sanirajak, Nunavut, Canada, April 9, 2025.
A helicopter flies over North Warning System Site CAM-5A, Cape McLoughlin, Northwest Territories, Canada, April 9, 2025.
A helicopter is refueled at North Warning System Site FOX-M Hall Beach, Sanirajak, Nunavut, Canada, April 9, 2025.
U.S. Air Force Air Combat Command Acquisition Management and Integration Center Detachment 1 team and other USAF personnel walk around the North Warning System Site FOX-M Hall Beach, Sanirajak, Nunavut, Canada, April 9, 2025.
U.S. Air Force Lt. Col. Alexander White, Acquisition Management and Integration Center Detachment 1 commander, exits a logistics facility at North Warning System Site FOX-M Hall Beach, Sanirajak, Nunavut, Canada, April 9, 2025.