KORENGAL VALLEY, AFGHANISTAN – OCTOBER 28: U.S. Army mortars explode on suspected Taliban insurgent positions during a firefight October 28, 2008 in the Korengal Valley in eastern Afghanistan. American forces from 2nd Platoon Viper Company of the 1-26 Infantry had occupied a strategic mountaintop when they were fired upon by Taliban insurgents. No Americans were injured in the fight and Taliban casualties were unknown. (Photo by John Moore/Getty Images)