The military outpost was run for years by U.S. troops as part of the war against the Islamic State group.
The Navy is looking for armed drones that can be launched from austere locations or from surface warships other than aircraft carriers.
By Michael Peck
The move brings to a close more than two decades of American military presence in the western part of the country.
The strike in Syria is the latest U.S. response in the wake of a Dec. 13 ambush there that killed two U.S. soldiers and one U.S. interpreter.
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