ARLINGTON, Va. -- Double-depth concrete liners are prepositioned on site at Arlington National Cemetery’s Millennium Project here October 20, 2015. The liners are a first for the cemetery, which in the past placed single-depth concrete liners into burial spaces just prior to a funeral service. The new system presets the liners at 18 inches below the surface, allows for two caskets to be placed inside and increases efficiency when prepping a plot for burial. Learn more about the Millennium Project at http://bit.ly/MillenniumProj. (U.S. Army photo/Patrick Bloodgood)