FORT A.P. HILL, Va. (March 10, 2021) U.S. Marines and Sailors with Chemical Biological Incident Response Force (CBIRF) participate in a Mission Readiness Exercise (MRX) aboard Fort A.P. Hill, Va., on March 10, 2021. Marines and Sailors stationed at CBIRF conduct MRX events in order to be fluent in rescue operations no matter their job, in the event CBIRF is called to action. (U.S. Marine Corps photo by Lance Cpl. Blakely Graham)