Air Force Tech. Sgt. Christian Runyon, fuel systems technician with the 379th Expeditionary Maintenance Squadron, watches the flaps go back up on a KC-135 Stratotanker after the gravity transfer valve operational check was completed at Al Udeid Air Base, Qatar, April 24, 2017. Completing the gravity transfer valve operational check helps ensure that the fuel system won’t malfunction during flight.

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Photo credit: © PR Library / Alamy / Afripics
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