RAQQA, SYRIA - NOVEMBER 25 : Minaret of al- Hinni Mosque is destroyed in air strikes by Syrian army warplanes on the ISIL-held northern city of Raqqa, Syria on November 25, 2014. At least 130 people have been killed when Syrian war planes struck in Raqqa. (Photo by Stringer/Anadolu Agency/Getty Images)
WASHINGTON, DC - FEBRUARY 04: Lt. Gen. Michael Flynn, director of the Defense Intelligence Agency, testifies during a hearing before the House (Select) Intelligence Committee February 4, 2014 on Capitol Hill in Washington, DC. The committee held a hearing to examine threats to the U.S. from all around the world. (Photo by Alex Wong/Getty Images)
Yemenis check the ruins of buildings destroyed in an air-strike by the Saudi-led coalition on February 25, 2016 in the capital Sanaa. / AFP / MOHAMMED HUWAIS (Photo credit should read MOHAMMED HUWAIS/AFP/Getty Images)
A member of the Iraqi government forces stands next to the charred vehicles on a road southwest of Fallujah on June 29, 2016 after Iraqi forces airstrikes destroyed 260 vehicles carrying militants from the Islamic State group trying to flee after their defeat in Fallujah. / AFP / MOADH AL-DULAIMI (Photo credit should read MOADH AL-DULAIMI/AFP/Getty Images)
UNSPECIFIED, PERSIAN GULF REGION - JANUARY 07: A U.S. Air Force MQ-1B Predator unmanned aerial vehicle (UAV), (R), returns from a mission to an air base in the Persian Gulf region on January 7, 2016. The U.S. military and coalition forces use the base, located in an undisclosed location, to launch drone airstrikes against ISIL in Iraq and Syria, as well as to transport cargo and and troops supporting Operation Inherent Resolve. The Predators at the base are operated and maintained by the 46th Expeditionary Reconnaissance Squadron, currently attached to the 386th Air Expeditionary Wing. (Photo by John Moore/Getty Images)
US Chief of Naval Operations Admiral John Richardson (R) and Deputy Chief of Naval Operations Vice Admiral John Aquilino, speak about the results of an investigation into a January incident where Iranian forces detained 10 US Navy personnel, during a press briefing at the Pentagon in Washington, DC, June 30, 2016. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
US Navy crew man machine-guns as they stand aboard a Riverine Command Boat off the coast of Bahrain's Salman port, near Manama, on May 12, 2013, one day before the start of the biggest exercise of mine countermeasure maneuvers 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)
ISTANBUL, TURKEY - JUNE 29: Ambulances arrives as relatives of the Ataturk Airport suicide bomb attack victims wait outside Bakirkoy Sadi Konuk Hospital, in the early hours of June 29, 2016 in Istanbul, Turkey. Three suicide bombers opened fire before blowing themselves up at the entrance to the main international airport in Istanbul, killing at least 31 people and wounding 147 people according to Justice Minister Bekir Bozdag. (Photo by Defne Karadeniz/Getty Images)
MT. SINJAR, NOVEMBER 12: A member of a Kurdish special forces regiment watches from a hilltop as US-led coalition airstrike targets a Islamic State position while a large convoy of Kurdish peshmerga forces drives to Sinjar city during a major offensive to expel Islamic State militants. (Alice Martins/For The Washington Post via Getty Images)
British Prime Minister David Cameron (L) speaks with Commander John Livesey RN as they walk on the Vanguard Class Submarine HMS Victorious on patrol off the west coast of Scotland on April 4, 2013. AFP PHOTO/ANDY BUCHANAN (Photo credit should read Andy Buchanan/AFP/Getty Images)
Members of the British Units during the opening ceremony of the Exercise Noble Partner 16, a Georgian, British and U.S. military training exercise taking place at Vaziani Training Area, Georgia, May 11-26, 2016.
Exercise Noble Partner includes approximately 500 Georgian, 150 United Kingdom and 650 U.S. service members who are incorporating a full range of equipment, including U.S. M1A2 Abrams Main Battle Tanks, M2A3 Bradley Infantry Fighting Vehicles, M119 Light Towed Howitzers and several wheeled support vehicles. Alongside U.S. forces, Georgian forces will operate their T-72 Main Battle Tanks, BMP-2 Infantry Combat Vehicles and several wheeled-support vehicles.
Wednesday, 11 May 2016, in Vaziani, Georgia. (Photo by Artur Widak/NurPhoto via Getty Images)
ALEPPO, SYRIA - JUNE 5: Smoke rises after Assad Regime and Russian army carried out an airstrike on Syrian opposition controlled Anadan district of Aleppo, Syria on June 5, 2016.
(Photo by Ahmed Muhammed Ali/Anadolu Agency/Getty Images)