U.S. Air Force Airmen assigned to the 435th Contingency Response Group prepare for night operations during exercise Swift Response 21 at Cheshnegirovo Airfield, Bulgaria, May 11, 2021. The exercise was an opportunity for the 435th CRG to sharpen its expeditionary skills and demonstrate its ability to stand-up core air mobility support functions and additional combat support functions that enable self-sustained airfield operations in austere locations during a rapidly developing crisis. (U.S. Air Force photo by Senior Airman John R. Wright)