161020-M-YL753-908 TRIANGLE, Va. (Oct. 20, 2016) Chemical Biological Incident Response Force (CBIRF) Marines from the Naval Support Facility in Indian Head, Md., participate in a CBIRF Engineer Field Exercise Oct. 17-20, 2016, at the Transportation Demonstration Support Area in Triangle, Va. Marines performed annual preventive maintenance services on various heavy equipment, such as the MCT 850 Cat Dozer and HYEX 250 Excavator, provided by Marine Corps Systems Command. Marines also refreshed their training on various systems, such as the Lightweight Water Purification System. (U.S. Marine Corps photos by Ashley Calingo/Released)