Airmen fuel an A-10 Thunderbolt II using an Aerial Bulk Fuel Delivery System out the back of a C-130J Super Hercules at Alpena Combat Readiness Training Center, Michigan, May 24, 2021, in support of Exercise Mobility Guardian 2021. The ABFDS, a portable 3,000-gallon fuel bladder, can be loaded on a C-130J Super Hercules, C-5 Galaxy, or C-17 Globemaster III and transported anywhere around the world. (U.S. Air Force photo by Senior Airman Aaron Irvin)