One of the 8,400 remaining U.S. troops in Afghanistan guards the bay of a CH-47 Chinook transport helicopter as it flies near Kabul. David Welna/NPR hide caption

Four Iraqi commandos at the base were among those awarded medals by Defense Secretary Ash Carter during his visit earlier this month. David Welna/NPR hide caption

Under new rules, the Justice Department can ask a federal court for permission to search mobile devices outside the court's district. Cliff Owen/AP hide caption

The U.S. Naval Station at Guantanamo holds the U.S. prison known as "Gitmo." President Obama said when he took office in 2009 that he wanted to close the prison, but 60 prisoners remain. John Moore/Getty Images hide caption

A picture taken on April 20, 2010, shows a Russian nuclear-capable Iskander ballistic missile launcher during a military parade rehearsal outside Moscow. Russia transferred Iskander-M missile launchers within range of three Baltic states earlier this month. Alexander Nemenov/AFP/Getty Images hide caption