VALLEY GREENS U.S. Army Sgt. Colin Unverzagt provides security after exiting a CH-47 Chinook helicopter with other soldiers during an operation in Afghanistan's Khost province, April 23, 2010. The operation is being conducted to reintroduce a coalition presence, help Afghan forces clear the Shembowat Valley and communicate with village elders in the province. The soldiers are assigned to 101st Airborne Division's Charlie Troop, 1st Squadron, 33rd Cavalry Regiment. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 984619-Y-MRJ74-663.jpg Photo Gallery