KANDAHAR AIR FIELD, Afghanistan — Air Force Col. Benjamin Wham, U.S. Army Corps of Engineers Afghanistan Engineer District South commander (left), Labib Bardawil, Contrack Inc. area manager (center), and Air Force Col. Sam Grable, 451st Air Expeditionary Mission Support Group commander, cut the ceremonial ribbon that marks the completion of the fourth phase of a Kandahar Airfield expansion in southern Afghanistan, April 10, 2012.