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)
Gunpowder and dirt fly as the 1st Cavalry Division horse detachment make their traditional 'cavalry charge' to conclude the 1st Air Cavalry Brigade's color casing ceremony, March 25, 2009, at Cooper Field, Fort Hood, Texas. U.S. Army photo.
An air weapons team of two AH-64D Apaches from the 1st Battalion, 227th Aviation Regiment, 1st Air Cavalry Brigade, 1st Cavalry Division, come in for a landing at Camp Taji, Iraq, after completing a reconnaissance mission in the skies over Baghdad Nov. 6, 2007. (Image: U.S. Army) ** FILE **
HOMEWARD BOUND: Soldiers with the 1st Cavalry Division show appreciation for the band Filter as they relax Thursday at Camp Virginia, Kuwait, where they await deployment home after leaving Iraq. (Associated Press)