U.S. Air Force Airman Austin Collings, fuels distribution specialist assigned to the 379th Expeditionary Logistics Readiness Squadron, watches gauges as he refuels a KC-135 Stratotanker at Al Udeid Air Base, Qatar, Jan. 23, 2018. Collings is using an R-12 fuel truck to fuel the KC-135 that is assigned to the 340th Expeditionary Air Refueling Squadron , which is responsible for delivering two-thirds of all fuel to airborne receivers in the U.S. Central Command’s area of responsibility. (U.S. Air National Guard photo by Master Sgt. Phil Speck)