In this Thursday, June 20, 2013 citizen journalism image provided by Aleppo Media Center AMC, which has been authenticated based on its contents and other AP reporting, a Syrian rebel fires a heavy machine gun towards Syrian soldiers loyal to Syrian President Bashar Assad in Aleppo, Syria. Congress is balking at the administration's first attempt to pay for lethal aid to the Syrian rebels until the White House presents a more fully developed proposal than one they received last week from Secretary of State John Kerry, including options for what the U.S. will do next if the initial surge of arms fails to improve the rebels' standing in the civil war that's gone on for more than two years. (AP Photo/Aleppo Media Center AMC)