U.S. Air Force Senior Airman Yahya Elgazar, left, fuels distribution technician with the 379th Expeditionary Logistics Readiness Squadron, Fuels Management Flight, talks about the importance of the gas meter to U.S. Army Spc. Anthony Jackson Jr., petroleum oils and lubricants specialist with the Headquarters and Headquarters Battalion 2-43 Air Defense Artillery, at Al Udeid Air Base, Qatar, Sept. 14, 2017. Jackson is learning about the responsibilities of operating an R-11 refueling truck and the equipment and storage facilities that are vital to the refueling process. (U.S. Air Force photo by Tech. Sgt. Amy M. Lovgren)