U.S. Army Crew Chief, from the Colorado Army National Guard, conducts preflight checks on a UH-60 Black Hawk helicopter in preparation for a blizzard response exercise at Buckley AFB, Aurora Colo., Jan 9, 2016.
Colorado Guard members and various local agencies are participating in a blizzard response exercise with local authorities this week. (U.S. National Guard photo by: SPC. Ashley Low/RELEASED). Original public domain image from Flickr