U.S. Air Force Staff Sgt. Ryan Tobkin, ICCN technician assigned to the 437th Aircraft Maintenance Squadron, rinses out his canteen with water at Chemical, Biological, Nuclear Explosives training during Crescent Reach 15, May 20, 2015. This is a local exercise, which lasted May 18-21, 2015, that tested and evaluated Joint Base Charleston's ability to launch a large aircraft formation in addition to process and deploy duty passengers along with cargo in response to a simulated crisis abroad. (U.S. Air Force photo by Senior Airman Jasmonet Jackson)