Cliff Owen / AP
Defense Secretary Jim Mattis said the Pentagon's assessment of the strike in Syria last week "damaged or destroyed" 20% of Syria's operational aircraft at the Shayrat airfield where the strike was targeted.
Why it matters: The Syrian government can't refuel or rearm its aircraft at the airfield the U.S. targeted, per Mattis.
Mattis finished his statement off with a warning shot to Syrian President Bashar al-Assad:
The Syrian government would be ill-advised ever again to use chemical weapons.