Arlington National Cemetery does not have rows of crosses as grave markers. The markers in that cemetery are simple tombstones, which may have a cross, a Star of David, a Masonic symbol, a Star and Crescent, a battalion or corps symbol, etc., engraved on them as chosen by the deceased or family. Photo galleries of Arlington National Cemetery are found at: www.arlingtoncemetery.org/. Richard O'Hair's grave at Arlington has the American Atheist logo on it. I have some pictures of that.
Harald Illig
Salt Lake City