FLIGHT OVER KHOST

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Sergeant First Class James Lee provides aerial security from the rear door of a CH-47 "Chinook" helicopter over the Khost province in eastern Afghanistan on Wednesday 24 February 2010.

In southern Afghanistan, the focus of American troops and their allies will soon shift to securing Kandahar following an ongoing offensive in the former Taliban stronghold of Marja.

CH-47 "Chinook" helicopters will likely play a key role as they are one of the primary air platforms for moving troops and supplies throughout Afghanistan.