Airmen of the 407th Air Expeditionary Group prepare to take-off on a C-17 Globemaster III cargo aircraft at Ali Air Base, Iraq, Dec. 18, 2011. These Airmen are the last service members to fly out of Iraq. The last remaining U.S. Airmen left Iraq per the Iraq and U.S. 2008 Security Agreement that required all U.S. service members to be out of the country by Dec. 31. Since 2003, more than 1 million Airmen, Soldiers, Sailors and Marines have served in Iraq. (U.S. Air Force photo/Master Sgt. Cecilio Ricardo)