BOLESLAWIECZ, Poland — Polish soldiers invite the public to view military equipment like the Main Battle Tank Leopard 2A5 as they commemorate Black Division Day. The military holiday commemorates the battle of Vienna and its commander, King John III Sobieski. King Sobieski is the patron of the 11th Lubuska Armored Cavalry Division, for the battle of Vienna is the largest known cavalry charge in history. (U.S. Army photo by Sgt. Shiloh Capers)