Senior Airman Steven Nicklas (left) and Staff Sgt. Manoel Robinson, 756th Air Refueling Squadron boom operators, approach 25K-loader to speak with the driver on the Joint Base Andrews, Maryland, flight line Aug. 1, 2017. Boom operators are required to pass an annual cargo-loading and offloading evaluation on the KC-135R Stratotanker aircraft. (U.S. Air Force photo/Tech. Sgt. Erica J. Knight)