The military outpost was run for years by U.S. troops as part of the war against the Islamic State group.
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.
Gregory Vandenberg bought fireworks to harm law enforcement officers at the "No Kings Day" protests held in California on June 14, the DOJ said.
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