In a sharp escalation of the U.S. role in Syria's bloody civil war, the White House announced late Thursday that it will provide military aid to rebels fighting to topple President Bashar al-Assad after confirming that his government used chemical weapons on the opposition. Deputy National Security Advisor for Strategic Communications Ben Rhodes told reporters on a conference call that President Barack Obama had heard pleas from Syria's rebel Supreme Military Council (SMC) for more help. "Our aim is to be responsive," Rhodes said, underlining that the new assistance would have "direct military purposes."