TIGRIS WATCH A U.S. Army soldier looks across the Tigris River while providing security during a visit to the ancient city of Ashur, the site is now known as Qalat Shergat, Iraq, Nov. 21, 2008. The soldiers are assigned to 1st Squadron, 3rd Armored Cavalry Regiment. Ashur is one of three World Heritage sites in Iraq. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 293294-U-KNG30-603.jpg Photo Gallery