Hmmm, this is a bit curious. How exactly did 9-feet-tall urns, that used to call the Arlington National Cemetery home, end up in an auction in Alexandria? Well the Army would sure like to know. The Potomack Company has 2 urns and 14 marble ballusters for sale at auction, all used to stand in the amphitheater next to the Tomb of the Unknown Soldier in the Arlington National Cemetery. Following the controversies the Arlington National…