Air Force Staff Sgt. Mark Siefner, a crew chief with the 334th Aircraft Maintenance Unit, out of Seymour Johnson Air Force Base, , repairs an F-15E Strike Eagle at Davis-Monthan AFB, Ariz., Jan. 18, 2017. New pilots from the 334th Fighter Squadron participated in a two week training course with the F-15E throughout southern Arizona's military operating areas.

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Photo credit: © Chuck Little / Alamy / Afripics
License: Licensed
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