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The attack on U.S. troops in Iraq is the first to inflict casualties since the fall of Syrian President Bashar Assad a year ago.

Three other service members were injured in the attack, during which the gunman was "engaged and killed", according to the US military.

Two Army soldiers and a civilian interpreter were killed by a suspected Islamic State attacker who targeted a convoy of U.S. and Syrian forces.

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Sgt. William Nathaniel Howard, 29, and Sgt. Edgar Brian Torres-Tovar, 25, were killed by a \

The two Iowa National Guard soldiers killed in an ambush by a lone gunman in Syria have been identified, the U.S. Army said Monday. A civil interpreter also died.

Sgt Edgar Brian Torres-Tovar, 25, and 29-year-old Sgt William Nathaniel Howard were remembered as dedicated soldiers