The weapons transfers have begun ahead of an upcoming offensive to recapture Raqa, the last major bastion for IS in Syria.
"We have begun to transfer small arms and vehicles to the Kurdish elements" of the Syrian Democratic Forces, Pentagon spokesman Major Adrian Rankine-Galloway said, referring to a Kurdish-Syrian Arab alliance fighting IS.
The weapons include AK-47s and small-caliber machine guns, Rankine-Galloway added.
President Donald Trump this month approved arming the fighters from the Kurdish Peoples' Protection Units (YPG).
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