A Libyan military guard stands in front of one of the U.S. Consulate's burned out buildings on Sept. 14. The U.S. is offering new details of the attack on the consulate that killed four Americans, including Ambassador Chris Stevens. Mohammad Hannon/AP hide caption

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Afghan soldiers stand at attention during a ceremony transferring authority from NATO-led troops to Afghan security forces in Afghanistan's Kunar province. The transfer of responsibility for security from NATO-led ISAF forces to Afghan troops is scheduled to be completed by the end of 2014. Rahmat Gul/AP hide caption

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U.S. Army Special Forces ride horseback as they work with members of the Northern Alliance in Afghanistan in 2001. AP hide caption

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Female Marines unload their rifles after a patrol with Afghan soldiers in Helmand province in June. The Marine Corps leadership has started an experiment to determine whether female Marine lieutenants have what it takes to become infantry officers and lead on the battlefield. Adek Berry/AFP/Getty Images hide caption

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Afghan children run to school on Sept. 24. Whoever takes over as the next U.S. president will have to determine how many troops will remain after the December 2014 deadline to help with long-term security. Jeff Pachoud/AFP/Getty Images hide caption

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Female Marines unload their rifles after a patrol with Afghan soldiers in Helmand province in June. The Marine Corps leadership has started an experiment to determine whether female Marine lieutenants have what it takes to become infantry officers and lead on the battlefield. Adek Berry/AFP/Getty Images hide caption

itoggle caption Adek Berry/AFP/Getty Images