U.S. Marines from the 2nd Platoon, Fleet Antiterrorism Security Team, Company A, Marine Corps Security Force Regiment, Norfolk Naval Station, Virginia, block an opening in a barrier during a training at Joint Base Langley-Eustis, Va. March 19, 2021. The training focused on fixed site security, detainee handling and the reporting procedures for incidents. (U.S. Air Force photo by Senior Airman Sarah Dowe)