MOUNTAIN DESCENT U.S. Army soldiers begin their descent from the summit of "Big Nasty," a mountain in Paktika province, Afghanistan, Sept. 8, 2011. The soldiers are assigned to Company C, 3rd Battalion, 66th Armor Regiment, 172nd Infantry Brigade. The unit was on a joint mission with the Afghan army and border patrol in the mountains near the Pakistan border. SHARE: Download: Full Size (43.59757 MB) Tags: week in photos, week in photos Credit: VIRIN: 058433-H-YWY25-340.jpg Photo Gallery