Airmen from the 816th Expeditionary Airlift Squadron participate in certifications on the Aerial Bulk Fuel Delivery System onboard a C-17 Globemaster III April 29, 2021, at Al Udeid Air Base, Qatar. The ABFDS allows members on the C-17 to deliver fuel to austere environments and perform hot pit refueling operations without the need of the R-11 fuel truck on the ground. (U.S. Air Force photo by Staff Sgt. Greg Erwin)