Photo taken on Oct. 20, 2019 shows part of a former U.S. military base near the city of Manbij in Syria's northern province of Aleppo. Syrian army entered the base on Sunday after the withdrawal of U.S. troops, which is one of the latest bases abandoned by U.S. forces since Turkey started a military campaign against Kurdish militia in northern Syria. (Photo by Ammar Safarjalani/Xinhua)