Tech. Sgt. Rochanapan Silpe goes hand over hand on the rope while hanging over a water hazard during a practice run on the obstacle course at the U.S. Air Force Academy, Colo., May 18, 2010. Sergeant Silpe is a Guardian Challenge 2010 competitor from the Space and Missile Systems Center's 61st Security Forces Squadron at Los Angeles Air Force Base. (Photo by Lou Hernandez)

Download Image: Full Size (1.63 MB)
Photo by: Lou Hernandez |  VIRIN: 100518-F-2428H-004.JPG