BAGRAM AIR BASE, AFGHANISTAN - APRIL 10:  A British Chinook helicopter, seen in this file photo, takes off April 13, 2002 from Bagram air base, Afghanistan, to deliver Royal Marines into the mountains of Afghanistan as part of Operation Jacana. A U.S. Chinook was shot down November 2, 2003 over the village of Baisa, Iraq.  At least 15 American troops are believed dead in what is so far been the blood single strike against U.S. troops since the invasion of Iraq by coalition forces.  (Photo by Tony Leather/Royal Navy/Getty Images)