Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, talks to airmen following a field exercise at Incirlik Air Base, Turkey, Aug. 2, 2016. The airmen are assigned to the 39th Security Forces Squadron base defense operations center. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, listens to Air Force Master Sgt. Gaston brief him as he observes airmen participating in a field exercise at Incirlik Air Base, Turkey, Aug. 2, 2016. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, left, chairman of the Joint Chiefs of Staff, speaks with Turkish Air Force Brig. Gen. Kemal Turan before departing Incirlik Air Base, Turkey, Aug. 2, 2016. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, meets with Ismail Kahraman, speaker of the Turkish Grand National Assembly, in Ankara, Turkey, Aug. 1, 2016. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, tours the Turkish Grand National Assembly with Gen. Hulusi Akar, chief of the Turkish General Staff, in Ankara, Turkey, Aug. 1, 2016. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, meets with Marines assigned to the Marine Corps Embassy Security Group at the U.S. Embassy in Ankara, Turkey, Aug. 1, 2016. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, speaks with a member of the U.S. Air Force after arriving at Incirlik Air Base, July 31, 2016. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, meets with Iraqi Prime Minister Haider al-Abadi in Baghdad, July 31, 2016. Dunford visited Iraq to assess the campaign against the Islamic State of Iraq and the Levant. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, meets with Iraqi Defense Minister Khaled al-Obaidi in Baghdad, July 31, 2016. Dunford visited Iraq to assess the campaign against the Islamic State of Iraq and the Levant. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, receives a campaign update from a U.S. service member near Irbil, Iraq, July 31, 2016. Dunford visited Iraq to assess the campaign against the Islamic State of Iraq and the Levant. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, meets with Massoud Barzani, president of Iraq’s Kurdistan region in Iraq, July 31, 2016. Dunford is visiting Iraq to assess the campaign against the Islamic State of Iraq and the Levant. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, talks with Army Lt. Gen. Sean MacFarland, commander of Combined Joint Task Force Operation Inherent Resolve, at the U.S. Embassy in Baghdad, July 30, 2016. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, speaks with Army Lt. Gen. Sean MacFarland, commander of Combined Joint Task Force Operation Inherent Resolve, during a visit to the U.S. Embassy in Baghdad, July 30, 2016. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, speaks with service members after arriving in Baghdad, July 30, 2016. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro