U.S. soldiers from the 2nd Brigade, 87th Infantry Regiment, 10th Mountain Division, secure the area after existing a Chinoonk helicopter, Helmand Province, southern Afghanistan, in this Sunday, June 18, 2006 file photo. Insurgents apparently shot down a U.S. military helicopter Saturday Aug. 6, 2011 similar to this one shown during fighting in eastern Afghanistan, killing 30 Americans, most of them belonging to the same elite Navy SEALs unit that killed Usama bin Laden, as well as seven Afghan commandos, U.S. officials said. An Afghan official says there is fighting in the area where a U.S. Army Chinook helicopter was apparently...