A US Navy crew mans a heavy machine gun on the deck of a Riverine Command Boat (RCB) as it tails the USS Ponci somewhere in the Arabian Sea, on May 13, 2013, on the first day of the biggest mine countermeasures exercise in the Arabian Gulf. The US Navy along with other 40 nations are conducting the games. AFP PHOTO/MARWAN NAAMANI (Photo credit should read MARWAN NAAMANI/AFP/Getty Images)
Rebel fighters walk in front of damaged buildings in Karm al-Jabal neighbourhood of Aleppo on August 26, 2014. The United States has begun reconnaissance flights over Syria and is sharing intelligence about jihadist deployments with Damascus through Iraqi and Russian channels, sources told AFP. AFP PHOTO/AMC/ZEIN AL-RIFAI (Photo credit should read ZEIN AL-RIFAI/AFP/Getty Images)
A Filipino fisherman is seen past the US Navy amphibious transport dock ship USS Green Bay (LPD-20) during an amphibious landing exercise on a beach at San Antonio in Zambales province on April 21, 2015, as part of annual Philippine-US joint maneuvers some 220 kilometres (137 miles) east of the Scarborough Shoal in the South China Sea. The Philippines voiced alarm April 20 about Chinese "aggressiveness" in disputed regional waters as it launched giant war games with the United States that were partly aimed as a warning shot to Beijing. AFP PHOTO/TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
Shiite fighters from the Popular Mobilisation units hold an Islamic State (IS) group upside down in the village of al-Azraqiyah as they advance towards the centre of Saqlawiyah, north west of Fallujah, on June 4, 2016, during an operation to regain territory from the jihadist group.
Iraqi pro-government forces, made up of fighters from the army, the police and from the Hashed al-Shaabi, gained new ground from the Islamic State group in a key area west of the jihadist bastion of Fallujah, security sources said. / AFP / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
French "Charles de Gaulle" aicraft carrier returns to the French naval base of Toulon, on March 16, 2016, after a mission against the Islamic State group in Gulf. / AFP / BORIS HORVAT (Photo credit should read BORIS HORVAT/AFP/Getty Images)
An aerial view shows a Philippine Navy vessel that has been grounded since 1999 to assert their nation's sovereignty over the Second Thomas Shoal, a remote South China Sea a reef also claimed by China, on March 29, 2014. Philippine soldiers aboard a fishing vessel engaged on March 29 in a dramatic stand-off with Chinese coastguard ships near a remote South China Sea reef claimed by both countries, an AFP journalist witnessed. AFP PHOTO / Jay DIRECTO (Photo credit should read JAY DIRECTO/AFP/Getty Images)
QUETTA, PAKISTAN - MAY 22 : Wreckage of a destroyed vehicle in which Mullah Mohammad Akhtar Mansour was allegedly traveling in Noshki, Balochistan province is seen after it was hit by US drone on May 22, 2016. According to reports a US drone attacked a vehicle said to be carrying Mullah Mansoor and his driver in Noshki, Balochistan province, Pakistan. (Photo by Barkat Tareen /Anadolu Agency/Getty Images)
SHANGHAI, CHINA-JUNE 21:(CHINA OUT) China Coast Guard vessels take part in a security drill on the East China Sea off Pudong's Luchaogang area in preparation for the Shanghai 2010 World Expo on June 21, 2009 in Shanghai, China. More than 1,000 servicemen from across the country, using 29 ships and two of Shanghai's police helicopters, participated in Sunday's exercise, which featured hostage rescue, firefighting and terrorism defense. The drill simulated attack scenarios in which terrorists hijacked a cargo ship, detained hostages on board and blew up the ship while fleeing by sea. (Photo by ChinaFotoPress/Getty Images)
This picture taken on May 19, 2016 shows the hall of the Roissy-Charles De Gaulle airport in Roissy-en-France near Paris. An EgyptAir flight which disappeared from radar screens en route from Paris to Cairo early on May 19, 2016, crashed into the sea off the southern Greek island of Karpathos while in Egyptian airspace, a Greece aviation source told AFP. "At around 0029 GMT (3:29 am) when it was in Egyptian airspace, the plane disappeared from Greek radars... it crashed around 130 nautical miles off the island of Karpathos," the source told AFP. AFP PHOTO / THOMAS SAMSON / AFP / THOMAS SAMSON (Photo credit should read THOMAS SAMSON/AFP/Getty Images)
AT SEA - DECEMBER 7: The future USS Zumwalt (DDG 1000) is underway for the first time conducting at-sea tests and trials on the Kennebeck River December 7, 2016 in the Atlantic Ocean.The Zumwalt is the largest destroyer ever built for the U.S. Navy. (Photo by U.S. Navy/General Dynamics Bath Iron Works via Getty Images)