U.S. Army engineers or "sappers" jump from a hovering UH-60 Black Hawk helicopter. U.S. Army engineers or "sappers" jump from a hovering UH-60 Black Hawk helicopter during the helocast event on day one of the Best Sapper Competition at Fort Leonard Wood, Mo., on April 7, 2011. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 894046-B-BKI48-669.jpg Photo Gallery