Tech. Sgt. Lucas Hagopian, left, and Staff Sgt. Timothy Mannion, perform a gun load on the 104th Fighter Wing's F-15 Eagle at the Air Force's Weapons System Evaluation Program, Tyndall Air Force Base, Florida. The purpose of WSEP to gauge operational effectiveness, to verify weapons system performance, determine reliability, and evaluate capability.

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Photo credit: © Chuck Little / Alamy / Afripics
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