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A Syrian rebel crosses a street while trying to dodge sniper fire in the old city of Aleppo in northern Syria on March 11, 2013. Syria warned on March 12 it is ready to fight "for years" against rebels, as world powers worked on a new initiative to find regime officials suitable for peace talks with the opposition. AFP PHOTO/JM LOPEZ        (Photo credit should read JM LOPEZ/AFP/Getty Images)
A Syrian rebel crosses a street while trying to dodge sniper fire in the old city of Aleppo in northern Syria on March 11, 2013. Syria warned on March 12 it is ready to fight "for years" against rebels, as world powers worked on a new initiative to find regime officials suitable for peace talks with the opposition. AFP PHOTO/JM LOPEZ        (Photo credit should read JM LOPEZ/AFP/Getty Images)

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    U.S. supplies Syrian rebels with 50 tons of ammo

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U.S. supplies Syrian rebels with 50 tons of ammo

CNN's Barbara Starr reports on a change of tactics by the U.S. in assisting rebel groups fighting ISIS.

U.S. supplies Syrian rebels with 50 tons of ammo

CNN's Barbara Starr reports on a change of tactics by the U.S. in assisting rebel groups fighting ISIS.