Images: Operation Enduring Freedom [Image 8 of 44]
Photo by Staff Sgt. Greg Biondo
U.S. Air Force Brig. Gen. Scott Dennis, an F-16C pilot and commander of the 451st Air Expeditionary Wing, puts on his oxygen mask before engine start-up, Kandahar Airfield, Afghanistan, April 5, 2012. The mission of the 451st Expeditionary Fighter Squadron is to deliver decisive airpower on target, on time.