160420-M-QB428-038 QUANTICO, Va. (April 20, 2016) Chemical Biological Incident Response Force, CBIRF, sharpened its skills to respond to a variety of contingencies by conducting waterborne mobility operations with Landing Craft Air Cushion, or LCACs, assigned to Navy Assault Craft Unit Four, ACU-4, to rehearse transportation of an Initial Response Force, or IRF, from Naval Annex Stump Neck to Marine Corps Base Quantico, Va. (U.S. Marine Corps photo by Sgt. Santiago G. Colon Jr./Released)