U.S. Marines assigned to Chemical Biological Incident Response Force (CBIRF) prepare to sling load cargo under a U.S Army UH-60 Black Hawk during a sling load training exercise at Naval Annex Stump Neck, Indian Head, Md., April 23, 2014. The training exercise was conducted in order to establish the capability for the CBIRF Situation Awareness Team to fly external loads. (U.S. Marine Corps photo by Lance Cpl. Alexander S. Norred/Released)