September 28, 2021 | Marine Corps Base Quantico, Va. -- September 28, 2021 | Marine Corps Base Quantico, Va. – U.S. Marines and Sailors with Chemical Biological Incident Response Force (CBIRF) conduct training with crew served weapons aboard MCB Quantico, Va, on Sept. 28, 2021. This type of training is conducted to familiarize Marines who may not use these weapon systems often, in how to operate them, no matter the Marine’s job. (Official U.S. Marine Corps photo by SSgt Kristian S. Karsten/Released)