US Army Patrols In Afghanistan's Restive Nuristan Province

SHEMGAL VALLEY, AFGHANISTAN - FEBRUARY 23: Members of the U.S. Army 1-6 Field Artillery division conduct a joint military exercise with the Afghan National Army February 23, 2009 in the Shemgal Valley in Nuristan Province, Afghanistan. As the security situation continues to challenge coalition forces, President Obama is sending an additional 17,000 American troops to Afghanistan this spring and summer, adding to the 36,000 Americans currently in Afghanistan. (Photo by Spencer Platt/Getty Images)