Dr. Dennis Montagna from the National Park Service talks about repairs made to the Tomb of the Unknowns. Montagna and other experts were invited by Arlington National Cemetery and Norfolk District, U.S. Army Corps of Engineers to inspect repairs made to cracks in the tomb that morning, Oct. 21, 2011. (U.S. Army photo/Kerry Solan)

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Photo by: Kerry Solan |  VIRIN: 111021-A-ET072-142.JPG