Aircraft stay ready to roll out

SPANGDAHLEM AIR BASE, Germany – U.S. Air Force Senior Airman Joshua Kujawa, 726th Air Mobility Squadron integrated flight control technician from Toms River, N.J., turns on the auxiliary power unit of a C-17 Globemaster III March 13, 2013. The APU is used to power parts of the aircraft when it is at rest if external power units are not available. (U.S. Air Force photo by Airman 1st Class Gustavo Castillo/Released)

PHOTO BY: Airman st Class Gustavo CastilloReleased
VIRIN: 130313-F-VI983-036.JPG
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