The back-blast from an AT-4 sent unsecured weapons and spent brass flying as soldiers from the 101st Airborne Division Alpha Battery 4 defended Combat Outpost Nolen from a Taliban attack on Sept. 11, 2010. Combat Outpost Nolen is located near the village of Jellawar in the Arghandab Valley. The United States and NATO have 150,000 troops in Afghanistan fighting the Taliban-led insurgency, most of them in the southern hotspots of Helmand and Kandahar provinces. (Photo by Patrick Baz/AFP/Getty Images)
