Lt. Col. David Fedroff, Norfolk District, U.S. Army Corps of Engineers deputy commander and Kathryn A. Condon, Arlington National Cemetery’s executive director, listen to feedback from experts about repairs made to the Tomb of the Unknowns. Norfolk District and the cemetery invited experts to the tomb Oct. 21, 2011 to inspect repairs made to cracks in the tomb's stone. (U.S. Army photo/Kerry Solan)