An Afghan security official holds his weapon ready as he walks next to the site of a suicide attack on the Afghan parliament building in Kabul on June 22, 2015. Taliban militants attacked the Afghan parliament on June 22, with gunfire and explosions rocking the building, sending lawmakers running for cover in chaotic scenes relayed live on television.The insurgents tried to storm the complex after triggering a car bomb but were repelled and have taken position in a partially-constructed building nearby, officials said about the ongoing attack. All MPs were safely evacuated after the attack, which came as the Afghan president's nominee for the crucial post of defence minister was to be introduced in parliament. AFP PHOTO / Wakil Kohsar (Photo credit should read WAKIL KOHSAR/AFP/Getty Images)
Iranian protesters raise their fists in front of a portrait of prominent Shiite Muslim cleric Nimr al-Nimr during a demonstration against his execution by Saudi authorities, on January 3, 2016, outside the Saudi embassy in Tehran. Iran and Iraq's top Shiite leaders condemned Saudi Arabia's execution of Nimr, warning ahead of protests that the killing was an injustice that could have serious consequences. AFP PHOTO / ATTA KENARE / AFP / ATTA KENARE (Photo credit should read ATTA KENARE/AFP/Getty Images)
TOPSHOT - A member of Iraqi pro-government forces stands amid the rubble of destroyed buildings in the Hoz neighbourhood in central Ramadi, the capital of Iraq's Anbar province, about 110 kilometers west of Baghdad, on December 27, 2015 during military operations conducted by Iraqi pro-government forces against the Islamic State (IS) jihadist group. Jihadist fighters abandoned their last stronghold in Ramadi today, bringing Iraqi federal forces within sight of their biggest victory since last year's massive offensive by the Islamic State group. AFP PHOTO / AHMAD AL-RUBAYE / AFP / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
Outgoing US Defense Secretary Chuck Hagel speaks to the press at the Pentagon in Washington,DC on January 22, 2015. AFP PHOTO/NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
AT SEA - AUGUST 13: In this handout photo provided by the U.S. Navy, a RIM-7P NATO Sea Sparrow Missile launches the Nimitz-class aircraft carrier USS Abraham Lincoln (CVN 72) during a stream raid shoot exercise on August 13, 2007 in the Pacific Ocean, At Sea. Lincoln's self-defense systems fired four Sea Sparrow missiles, engaging and destroying two BQM-74E turbojet-powered drone aircraft and a High-Speed Maneuvering Surface Threat (HSMST) remote controlled Rigid Hulled Inflatable Boat (RHIB) during the event. Lincoln and embarked Carrier Air Wing (CVW) 2 are underway off the coast of Southern California conducting Tailored Ship's Training Availability (TSTA). (Photo by Jordon R. Beesley/U.S. Navy via Getty Images)
A United States Navy Boeing P-8 Poseidon takes off from Perth International Airport as part of the search to locate missing Malaysia Airways Flight MH370 on April 15, 2014. A mini-sub hunting for Malaysian jet MH370 prepared to make a second mission to the remote Indian Ocean seabed on April 15 after aborting its first search as it encountered water deeper than its operating limits, officials said. AFP PHOTO / Richard Wainwright / POOL (Photo credit should read RICHARD WAINWRIGHT/AFP/Getty Images)
SAN BERNARDINO, CA - DECEMBER 03: FBI agents and local law enforcement examine the crime scene where suspects of the Inland Regional Center were killed on December 3, 2015 in San Bernardino, California. Police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 17 injured. (Photo by Sean M. Haffey/Getty Images)
US soldiers part of NATO patrol during the final day of a month long anti-Taliban operation by the Afghan National Army (ANA) in various parts of eastern Nangarhar province, at an Afghan National Army base in Khogyani district on August 30, 2015. Afghan security forces launched a joint anti-militant operation in three districts, killing over 150 armed insurgents and wounding 112 others with 13 security personnel killed and three others were wounded in the past 30 days, Afghan National Army Commander Zaman Waziri said. AFP PHOTO / Noorullah Shirzada
(Photo credit should read Noorullah Shirzada/AFP/Getty Images)
PARIS, FRANCE - NOVEMBER 15: People gather outside of Notre Dame Cathedral ahead of a ceremony to the victims of the Friday's terrorist attacks on November 15, 2015 in Paris, France. As France observes three days of national mourning members of the public continue to pay tribute to the victims of Friday's deadly attacks. A special service for the families of the victims and survivors is to be held at Paris's Notre Dame Cathedral later on Sunday. (Photo by David Ramos/Getty Images)
This photo made during an escorted visit and reviewed by the US military, shows the razor wire-topped fence and a watch tower at the abandoned "Camp X-Ray" detention facility at the US Naval Station in Guantanamo Bay, Cuba, April 9, 2014. AFP PHOTO/MLADEN ANTONOV (Photo credit should read MLADEN ANTONOV/AFP/Getty Images)