U.S. Air Force Airman 1st Class Steven Renninger, 633rd Security Forces Squadron installation entry controller, surveys for enemy combatants during a field training exercise at Marine Corps Base Quantico, Virginia, August 1, 2019. During the FTX, members of the 633rd SFS practiced situations in high-stress environments to help prepare them for the possibility of being downrange. (U.S. Air Force photo by Airman 1st Class Marcus M. Bullock)