Air Force Staff Sgt. William Vigil, an aerospace propulsion mechanic with the 187th Maintenance Squadron, Montgomery Regional Air National Guard Base, Ala., replaces a divergent seal on the engine exhaust nozzle of a Air Force F-16 Fighting Falcon February 28, 2017, on the flight line during Red Flag 17-2 at Nellis Air Force Base, Nev. The 187th MXS is a unit within the 187th Fighter Wing, Montgomery Regional ANGB, Ala., participating in Red Flag 17-2. Aerospace propulsion mechanics ensure the F-16's are able to maintain the flying schedule during the two week exercise.

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Photo credit: © Conner Flecks / Alamy / Afripics
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