Tech. Sgt. Kenneth Cook, a 6th Air Refueling Squadron boom operator instructor, pauses for a photo prior to a mission on a KC-10 Extender at Travis Air Force Base, Calif., June 17, 2017. Cook led a team assigned to loading 15,000 pounds of cargo prior to a flight to Joint Base Pearl Harbor-Hickam, Hawaii. (U.S. Air Force photo/Tech. Sgt. James Hodgman)