THULE AIR BASE, Greenland – American and Canadian servicemembers refuel a Royal Canadian Air Force CF-18 Hornet at Thule Air Base, Greenland, March 15, 2022, during Operation NOBLE DEFENDER. North American Aerospace Defense Command is a United States and Canadian bi-national command charged with three missions: aerospace warning, aerospace control, and maritime warning. (U.S. Air Force photo by Staff Sgt. Carlos Ferran)