Master Sgt. David "Dino" Dines, changes out the film aboard an OC-135B observation aircraft with the 45th Reconnaissance Squadron, Offutt AFB, Neb., during pre-flight 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 by Airman 1st Class Perry Aston (Released)