Master Sgt. David Dines changes out the film aboard an OC-135B Open Skies observation aircraft during pre-flight checks Jan 16, 2010, at Joint Base Andrews, Md. The OC-135B is used to conduct observation flights in support of the Open Skies Treaty. The OC-135B is with the 45th Reconnaissance Squadron at Offutt Air Force Base, Neb. (U.S. Air Force photo/Airman 1st Class Perry Aston)
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