U.S. Air Force Senior Airman Sean Gilliland, 435th Contingency Response Squadron radio frequency transmissions systems technician, right, establishes communications during exercise Swift Response 21 at Cheshnegirovo Airfield, Bulgaria, May 11, 2021. With its highly skilled, multi-capable Airmen, the 435th Contingency Response Group enabled rapid C-17 Globemaster III and C-130 Hercules aircraft launch, recovery, airdrop and air-land operations within a strict time frame. (U.S. Air Force photo by Senior Airman John R. Wright)