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In this file photo, a U.S. Air Force F-22 Raptor, assigned to the 3rd Wing, takes off from Joint Base Elmendorf-Richardson, Alaska, during exercise Northern Edge 2017, May 11, 2017. With participants and assets from the U.S. Air Force, Army, Marine Corps, Navy and Coast Guard, Northern Edge is Alaska’s premier joint-training exercise designed to practice operations and enhance interoperability among the services.