Contractors working for the Norfolk District, U.S. Army Corps of Engineers place fossilized shell, obtained from the Virginia Marine Resources Commission, on sanctuary reefs in the Great Wicomico River in Burgess, Virginia. The reefs, originally built in 2004 by the Corps of Engineers, are receiving the new shell as part of an adaptive management/rehabilitation project, which is building them up to a higher level promoting a healthier oyster reef. (U.S. Army photo/Patrick Bloodgood)