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JOINT PACIFIC ALASKA RANGE COMPLEX, Alaska (June 22, 2015) - U.S. Air Force firefighters with 673rd Civil Engineer Squadron, Civil Engineer Fire, answer a Flight Line 911 call during Exercise Northern Edge. Northern Edge 2015 is Alaska's premier joint training exercise designed to practice operations, techniques and procedures as well as enhance interoperability among the services. Thousands of participants from all services from active duty, Reserve and National Guard units are involved.