U.S. Army National Guard Spc. Kurt Barth shows volunteers characteristics of the tail of a UH-60A Black Hawk helicopter during the Vigilant Front Range exercise at Buckley Air Force Base, Colo., on May 15, 2009. U.S. Army National Guard Spc. Kurt Barth shows volunteers characteristics of the tail of a UH-60A Black Hawk helicopter during the Vigilant Front Range exercise at Buckley Air Force Base, Colo., on May 15, 2009. The exercise involves federal, state and local agencies in Colorado and more than 100 volunteers. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 776097-C-GHG53-352.jpg Photo Gallery