US Navy patrol boats escort the French Navy aircraft carrier the Charles de Gaulle as the ship leaves the port of Bahraini capital Manama on February 22, 2015. AFP PHOTO / PATRICK BAZ (Photo credit should read PATRICK BAZ/AFP/Getty Images)
A man watches a TV news showing file footage of a North Korean missile launch at a railway station in Seoul on April 28, 2016.
North Korea on April 28 tried and failed in what appeared to be its second attempt in two weeks to test a powerful, new medium-range ballistic missile, South Korea's defence ministry said. / AFP / JUNG YEON-JE (Photo credit should read JUNG YEON-JE/AFP/Getty Images)
A Jordanian soldier stands guard as Syrian refugees arrive to a camp on the Jordanian side at the north east of Jordan's border with Syria, at the Al-Hadalat crossing point in the eastern town of Ruwaished, on May 4, 2016.
According to the Jordanian Commander of the Border Guards Brigadier Saber Al-Mahayreh, around 5000 Syrians fleeing from recent attacks on the northern Syrian city of Aleppo are trying to cross into Jordan in search of safety and most are exhausted and desperately in need of help and medical treatment. / AFP / KHALIL MAZRAAWI (Photo credit should read KHALIL MAZRAAWI/AFP/Getty Images)
SYRIA JUNE 18, 2016: Russia's Defense Minister Sergei Shoigu (C) inspects the Hmeymim airbase in Syria. Vadim Savitsky/TASS (Photo by Vadim SavitskyTASS via Getty Images)
US President Barack Obama is greeted by Secretary of State John Kerry before he addresses the Chief of Missions conference at the State Department in Washington, DC, on March 14, 2016. / AFP / Nicholas Kamm (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
NATO troops make a massive amphibious landing off the coast of Ustka, northern Poland, during NATO military sea exercises BALTOPS (Baltic Operations) on June 17, 2015 in the Baltic Sea. The multinational exercise of NATO allied and partner nations aims to demonstrate their collective capability to defend the Baltic region. AFP PHOTO / JANEK SKARZYNSKI (Photo credit should read JANEK SKARZYNSKI/AFP/Getty Images)
Iraqi government forces stand next to an armoured vehicle during an operation, backed by air support from the US-led coalition, in Fallujah's southern Shuhada neighbourhood to retake the area from the Islamic State (IS) group on June 15, 2016.
The Islamic State group battled Iraqi forces and held civilians hostage to defend its bastion of Fallujah, where three weeks of fighting has forced tens of thousands from their homes. Security forces have retaken significant parts of southern Fallujah over the past two weeks and are now attacking the jihadists in the Jbeil neighbourhood, officers said.
/ AFP / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
AT SEA - MARCH 8: In this handout photo provided by the U.S. Navy, the amphibious assault ship USS Boxer (LHD 4) transits the East Sea on March 8, 2016 during Exercise Ssang Yong 2016. Ssang Yong 16 is a biennial combined amphibious exercise conducted by forward-deployed U.S. forces with the Republic of Korea Navy and Marine Corps, Australian Army and Royal New Zealand Army Forces. (Photo by MCSN Craig Z. Rodarte/U.S. Navy via Getty Images)
Lights from police vehicles light up the scene infront of the Pulse club in Orlando, Florida on June 12, 2016.
Fifty people died when a gunman allegedly inspired by the Islamic State group opened fire inside a gay nightclub in Florida, in the worst terror attack on US soil since September 11, 2001. / AFP / Mandel Ngan (Photo credit should read MANDEL NGAN/AFP/Getty Images)
TO GO WITH AFGHANISTAN-US-ARMY-CONFLICT-FOCUS BY GUILLAUME DECAMME
In this photograph taken on August 12, 2015, US army soldiers walk past an Afghan National Army (ANA) base in the Khogyani district in the eastern province of Nangarhar. From his watchtower in insurgency-wracked eastern Afghanistan, US army Specialist Josh Whitten doesn't have much to say about his Afghan colleagues. "They don't come up here anymore, because they used to mess around with our stuff. "Welcome to Forward Operating Base Connelly, where US troops are providing training and tactical advice to the 201st Afghan army corps as they take on the Taliban on the battlefield. AFP PHOTO / Wakil Kohsar (Photo credit should read WAKIL KOHSAR/AFP/Getty Images)
An F-18 jet fighter flies out of the USS Eisenhower aircraft carrier in the Arabian sea on May 24, 2010. The USS Eisenhower is on a mission to support US-led coalition forces in Afghanistan. AFP PHOTO/MARWAN NAAMANI (Photo credit should read MARWAN NAAMANI/AFP/Getty Images)
AT SEA - MARCH 21: In this Navy handout photo, 2000 pound GBU-31 Joint Direct Attack Munitions (JDAM) are transported to the flight deck of the USS Harry S. Truman March 21, 2003 in the Mediterranean Sea. The bombs will be loaded onto fighter jets to support the war in Iraq. (Photo by U.S. Navy/ Michael W. Pendergrass/Getty Images)
ZHUHAI, CHINA - NOVEMBER 5: (CHINA OUT) J-10, China's multirole fighter planes perform a demonstration at the 7th China International Aviation and Aerospace Exhibition, on November 5, 2008 in Zhuhai of Guangdong Province, China. The event, also known as 'Airshow China', is scheduled to run from November 4 to 9, 2008 in Zhuhai, attracting nearly 600 exhibitors from over 30 countries and regions. (Photo by China Photos/Getty Images)