** FILE ** Soldiers of the Army's 5th Battalion, 20th Infantry Regiment, 2nd Infantry Division, rest as they have arrive to a US military Base Warhorse in Baqouba, Iraq, 60 kilometers (35 miles) north east of Baghdad, Tuesday, March 13, 2007. More than 700 additional U.S. troops arrived in Iraq's increasingly volatile Diyala province on Tuesday, to try to quell burgeoning violence just northeast of Baghdad during a security crackdown there. (AP Photo/Lauren Frayer)