In the heart of rebel-held territory in Syria's northern province of Aleppo, a small group of intrepid Westerners is undertaking a mission of great stealth. Living anonymously in a small rural community, they travel daily in unmarked cars, braving airstrikes, shelling and the threat of kidnapping to deliver food and other aid to needy Syrians — all of it paid for by the U.S. government.

So secretive is the operation, however, that almost none of the Syrians who receive the help are aware of its American origins. Out of concern for the safety of the recipients and the delivery staff, who could be targeted by the government if their affiliation to the United States were known, the Obama administration and the aid workers have chosen not to advertise the assistance.

Meanwhile, as the death toll mounts and the regime led by President Bashar Assad shows no sign of giving up, anger about the perceived failure of the U.S. to help mounts steadily among Syrians who support the rebellion.