JOINT BASE ELMENDORF-RICHARDSON, Alaska – Air Force Tech. Sgt. Erik Esquerra, a KC-10 Extender boom operator with the 9th Air Refueling Squadron based out of Travis Air Force Base, Calif., prepares to conduct in-flight refueling for multiple aircraft during Northern Edge 2017, May 4, 2017. NE17 is Alaska’s premier joint training exercise designed to practice operations, techniques and procedures, as well as enhance interoperability among the services. ( Air Force photo by Staff Sgt. Westin Warburton)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: 17, edge, ne17, northern