Syria's U.S.-trained opposition fighters wait to learn of their role in a new Syria

AL-TANF GARRISON, Syria — When Salim Turki al-Anteri took his opposition forces into battle against regime troops in southern Syria this month, it was against his own former tank unit. Drawing on his past U.S. military training and his hopes for a united Syria, the commander ordered his forces to fire artillery warning shots, intended to persuade regime soldiers to abandon their tanks and leave the battlefield. "We didn't want to kill any soldiers," he says...