Rebel forces from Jaysh al-Islam (Army of Islam) take position behind a sand barrier on August 25, 2015 on the frontline in the Bashkoy area, on the northern outskirts of Aleppo, where opposition fighters are battling Syrian pro-government forces. AFP PHOTO / AMC / ZEIN AL-RIFAI (Photo credit should read ZEIN AL-RIFAI/AFP/Getty Images)
US Marines from 1st Battalion 7th Marines Regiment hold a shura meeting with local police and residents at PB Fulod in Sangin on June 12, 2012. The US-led war in Afghanistan has cost the lives of around 3,000 US and allied troops, seen thousands of Afghans killed and cost hundreds of billions of dollars. AFP PHOTO / ADEK BERRY (Photo credit should read ADEK BERRY/AFP/GettyImages)
WASHINGTON, DC - SEPTEMBER 16: Gen. Lloyd Austin III (L), commander of U.S. Central Command, greets Senate Armed Services Committee Chairman John McCain (R-AZ) before a hearing about the ongoing U.S. military operations to counter the Islamic State in Iraq and the Levant (ISIL) during a hearing in the Dirksen Senate Office Building on Capitol Hill September 16, 2015 in Washington, DC. Austin said that slow progress was still being made against ISIL but there have been setbacks, including the ambush of U.S.-trained fighters in Syria and the buildup of Russian forces in the country. (Photo by Chip Somodevilla/Getty Images)
TAL ABYAD, SYRIA - JUNE 19: (TURKEY OUT) A Kurdish People's Protection Units, or YPG fighter controls the weapons in downtown of Tal Abyad, Syria. June 19, 2015. Kurdish fighters with the YPG took full control of Tal Abyad, dealing a major blow to the Islamic State group's ability to wage war in Syria. Mopping up operations have started to make the town safe for the return of residents from Turkey, after more than a year of Islamic State militants holding control of the town. (Photo by Ahmet Sik/Getty Images)
