National Edition News cover for July 27, 2015 - Generals say U.S. exit let Islamic State enter Iraq: Soldiers from the 3rd Brigade, 1st Cavalry Division board a C-17 transport plane to depart from Iraq at Camp Adder, now known as Imam Ali Base, on Saturday Dec. 17, 2011, near Nasiriyah, Iraq. Around 500 troops from the 3rd Brigade, 1st Cavalry Division ended their presence at Camp Adder, the last remaining American base, and departed in the final American military convoy out of Iraq, arriving into Kuwait in the early morning hours of December 18, 2011. (AP Photo / Mario Tama)