FAST REACTION A U.S. Navy corpsman and Marines work on an injured Marine while concealed in brush and trees in Sangin, Afghanistan, July 22, 2010. The injured Marine stepped on an improvised explosive device, but was saved through the fast reaction of those around him. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 043344-E-WPV12-557.jpg Photo Gallery