Senior Airman Brandon Hefner, 22nd Maintenance Squadron electrical environmental specialist, re-installs an outflow valve on a KC-135 Stratotanker at the isochronal inspection dock, Dec. 17, 2009, at McConnell AFB, Kan. Reattaching this particular part is vital because it regulates cabin pressure to maintain a safe and comfortable environment for crew and passengers. The efforts of the maintainers in the ISO dock help ensure the three-man KC-135 crew can accomplish their mission of delivering cargo and refueling aircraft worldwide. (U.S. Air Force photo/Airman 1st Class Andrea Salazar)
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