WASHINGTON, DC - JANUARY 17: (AFP OUT) U.S. President Barack Obama delivers a statement on the relations between US and Iran, including the release of the US hostages that were held in Iran, in the cabinet room of the White House on January 17, 2016 in Washington, DC. Obama praised the implementation of a completed nuclear agreement with Iran and the return of five American prisoners that the country was holding resulting in a lifting of economic sanctions. (Photo byAude Guerrucci-Pool/Getty Images)
Special police forces are seen during search operations following an attack by Al-Qaeda linked gunmen on January 16, 2016 in Ouagadougou.
Security forces in Burkina Faso on January 16 completed a counter-offensive against jihadist assailants who stormed a top hotel and a restaurant in the capital hours earlier, a security source said. The source said security forces were continuing search operations in the area around the Splendid hotel and nearby Cappuccino restaurant, which were attacked by the Al-Qaeda-linked gunmen late on January 15, killing at least 23 people. / AFP / AHMED OUOBA (Photo credit should read AHMED OUOBA/AFP/Getty Images)
Commander of U.S. and NATO forces in Afghanistan, General John F. Campbell stands beside a map of the northern Afghan city of Kunduz as he addresses a press conference at Resolute Support headquarters in Kabul on November 25, 2015. A deadly air strike on a Doctors Without Borders (MSF) hospital was "caused primarily by human error", the US commander in Afghanistan said Wednesday, promising disciplinary action as he detailed a US investigation into the catastrophic attack. AFP PHOTO/Massoud HOSSAINI/POOL / AFP / POOL / MASSOUD HOSSAINI (Photo credit should read MASSOUD HOSSAINI/AFP/Getty Images)
US Special Operations Commander General Joseph Votel (R) listens as US President Barack Obama (L) delivers a statement to reporters following a National Security Council meeting on the counter-ISIL at the Pentagon in Washington, DC, December 14, 2015. AFP PHOTO / JIM WATSON / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Iranian Revolutionary Guards drive speedboats during a ceremony to commemorate the 24th anniversary of the downing of Iran Air flight 655 by the US navy, at the port of Bandar Abbas on July 2, 2012. The plane was shot down by mistake over the Gulf by the US navy's guided missile cruiser, USS Vincennes, during confrontation with Iranian speedboats on July 3, 1988, killing 290 civilian passengers and crew members. AFP PHOTO/ATTA KENARE (Photo credit should read ATTA KENARE/AFP/GettyImages)
CREECH AIR FORCE BASE, NV - AUGUST 08: U.S. Air Force Maj. Casey Tidgewell pilots an MQ-9 Reaper on a training mission from a ground control station August 8, 2007 at Creech Air Force Base in Indian Springs, Nevada. The Reaper is the Air Force's first "hunter-killer" unmanned aerial vehicle (UAV), designed to engage time-sensitive targets on the battlefield as well as provide intelligence and surveillance. The jet-fighter sized Reapers are 36 feet long with 66-foot wingspans and can fly for up to 14 hours fully loaded with laser-guided bombs and air-to-ground missiles. They can fly twice as fast and high as the smaller MQ-1 Predators, reaching speeds of 300 mph at an altitude of up to 50,000 feet. The aircraft are flown by a pilot and a sensor operator from ground control stations. The Reapers are expected to be used in combat operations by the U.S. military in Afghanistan and Iraq within the next year. (Photo by Ethan Miller/Getty Images)
