FORT DRUM - Members of the New York Air National Guard's 274th Air Support Operations Squadron (ASOS) disembark from a CH-47F helicopter flown by the New York Army National Guards Co. B 3rd Battalion 126th Aviation on to a rooftop LZ at Fort Drum N.Y.s urban training site during joint training on Saturday March 5 2016 . The 274th mission is to advise U.S. Army commanders on how to best utilize U.S. and NATO assets for Close Air Support. The CH-47 aircrew supported the joint terminal attack controllers of the 274th in an air insertion exercise in an urban environment.