Donnie Coleman, a Boykin contracting glazier applies caulk to a window panel, Shaw Air Force Base, S.C., June 21, 2013. The air tower has been undergoing maintenance since September, which recently has led into a replacement of all the windows. (U.S. Air Force photo by Airman 1st Class Ashley L. Gardner/Released)

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Photo by: Airman st Class Ashley L. GardnerReleased |  VIRIN: 130623-F-VU971-010.JPG