U.S. Army Gen. David H. Petraeus, commanding general of the NATO International Security Assistance Force (ISAF) and U.S. Forces Afghanistan (USFOR-A), delivers remarks before he administers the oath of re-affirmation and re-enlistment to U.S. service members at Kandahar Airfield in Kandahar in this Photo taken July 4, 2011. REUTERS/Haraz N. Ghanbari/U.S. Navy/Handout