Free Syrian Army fighters sit behind their anti-aircraft weapon in Aleppo, Syria. Syrian rebels brought their fight within a mile of the heart of Damascus on Friday, seizing army checkpoints and cutting a key highway with a row of burning tires as they pressed their campaign for the heavily guarded capital, considered the likely endgame in the nearly 2-year-old civil war. Photo: Abdullah Al-Yassin, ASSOCIATED PRESS / AP2013