Pentagon says U.S. reducing troops levels in Syria as situation evolves on ground / U.S. begins troop drawdown in Syria as allies boost new government / Future of US bases in Syria under discussion -- Syrian authorities / China concerned by reports of Uygur militants given senior roles in Syrian army / Turkey's, US defense chiefs discuss Syria, security issues / U.S. military mission in Syria will pose an early dilemma for Trump / The significance of U.S. officials in Syria amid search for Austin Tice / U.S. officials in direct contact with Syria's new leaders / US military reveals B-52 role in Syrian operations / Syrian rebels deliver American to U.S. military post, photos show