U.S. Air Force Staff Sgt. Kyle Hiener cuts defective pavement on the runway so it can be jack hammered and replaced with asphalt at Joint Base Charleston, S.C., March 25, 2010. Base civil engineers perform monthly runway closures to repair discrepancies as well as on an as-need basis. Sergeant Hiener is a pavements and equipment technician with the 628th Civil Engineer Squadron. (U.S. Air Force photo by James M. Bowman/released)

U.S. Air Force Staff Sgt. Kyle Hiener cuts defective pavement on the runway so it can be jack hammered and replaced with asphalt at Joint Base Charleston, S.C., March 25, 2010. Base civil engineers perform monthly runway closures to repair discrepancies as well as on an as-need basis. Sergeant Hiener is a pavements and equipment technician with the 628th Civil Engineer Squadron. (U.S. Air Force photo by James M. Bowman/released)

U.S. Air Force Airman 1st Class Jerry Cook uses a jack hammer to break up defective pavement on the runway while Airman 1st Class Michael Childers uses a street sweeper vacuum to suck up the debris so it can be replaced with asphalt at Joint Base Charleston, S.C., March 25, 2010. Base civil engineers have monthly runway closures to repair discrepancies as well as on an as-need basis. Airmen Cook and Childers are pavements and equipment journeymen with the 628th Civil Engineer Squadron. (U.S. Air Force photo by James M. Bowman/released)

U.S. Air Force Airman 1st Class Michael Childers uses a street sweeper vacuum to suck up debris on the runway so it can be replaced with asphalt at Joint Base Charleston, S.C., March 25, 2010. Base civil engineers have monthly runway closures to repair discrepancies as well as on an as-need basis. Airman Childers is a pavements and equipment journeyman with the 628th Civil Engineer Squadron. (U.S. Air Force photo by James M. Bowman/released)

U.S. Air Force Airman 1st Class Jerry Cook uses a jack hammer to break up defective pavement on the runway so it can be removed and replaced with asphalt at Joint Base Charleston, S.C., March, 25, 2010. Base civil engineers have monthly runway closures to repair discrepancies as well as on an as-need basis. Airman Cook is a pavements and equipment journeyman with the 628th Civil Engineer Squadron. (U.S. Air Force photo by James M. Bowman/released)