Confederate Flags at National Cemeteries

In many years of visiting Civil War-era cemeteries, I've seen a mile of Confederate flags -- but I've never seen one in a National Cemetery. that I remember.  And I'm pretty sure I'd remember it.   Not even the National Cemeteries that dot the south (like those for the soldiers who fell at Cold Harbor, at Petersburg, and in the prisons at Danville).  So I was beyond surprised to learn -- and believe me that takes a lot -- that sometimes Confederate flags are placed on the graves at National cemeteries in the south.

The image is the Danville National Cemetery; it is adjacent to a historically African American cemetery and a historically white cemetery.