A Free Syrian Army fighter runs after attacking a tank with a rocket-propelled grenade during fighting in Aleppo, Syria, in September 2012. The rebels say they are willing to take on the Islamic State, but need more weapons.
Soldier of U.S. Army 173rd Airborne Brigade prior to an air analysis mission near an oil and gas separation plant at the Baba Gurgur oil field outside northern Iraq's town of Kirkuk in May 2003.
This photo released by Vandenberg Air Force Base on Monday shows the X-37B Orbital Test Vehicle, the Air Force's unmanned, reusable space plane, after it landed at Vandenberg from a previous orbital mission.
Twitter is suing the federal government over First Amendment rights. The tech company says the government stopped it from releasing extra detail about government requests for user information.