U.S. airman technician Sgt. Shai M. Barfield of Phoenix, Ariz., checks the tail rotor of the Black Hawk helicopter at the air base in Bagram, Afghanistan, 55 kilometerss (34 miles) north of Kabul, Monday, Oct. 28, 2002. The presence of a 21-nation peacekeeping force has helped bring security to the Afghan capital after 23 years of conflict. (AP Photo/Amel Emric)
