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