(FILES) This file photograph taken on November 11, 2009 US Army soldiers from 2-506 Infantry 101st Airborne Division and Afghan National Army soldiers race to get out of the way of a CH-47 Chinook helicopter landing in hostile territory during the launch of Operation Radu Bark VI in the Spira mountains in Khost province, five kms from the Afghan-Pakistan Border, directly across the border from Pakistan's lawless Waziristan region. On August 7, 2011 officials said thirty US troops including special forces died when the Taliban shot down their helicopter in Wardak province southwest of Kabul, late on August 5, in the biggest single loss for foreign troops in the decade-long war. There are currently around 140,000 foreign soldiers in Afghanistan, around 100,000 of them from the US, but all combat forces are due to leave by the end of 2014. AFP PHOTO/DAVID FURST/FILES
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US soldiers prepare for the landing of a CH-47 Chinook helicopter in Afghanistan in this 2009 photo. The helicopter is similar to the one that was shot down on Friday killing 38 US and Afghan troops iShow more

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