“We are ready once the first rocket is launched,” said Col. Qassim Saad Eddine, spokesman for the Supreme Military Council, which oversees the U.S.-backed Free Syrian Army. “We will attack the military sites, not just in one province, but all over Syria.”

Saad Eddine said Free Syrian Army chief of staff Gen. Salim Idriss and the rebel command have been told they would receive some notice of a U.S. attack, perhaps a few hours in advance, but have not coordinated targets with U.S. or allied military personnel.

“The targets are already known,” he said, referring to Syrian military and command installations.

But one opposition commander, Col. Abduljabbar Akidi, who heads the Free Syrian Army contingent in northern Syria’s Aleppo province, said by Skype that coordination on potential targets is already underway in joint operation rooms in Turkey and Jordan with “supporting countries,” including the United States.

“If they strike the regime with a crippling hit, we will finish them off,” Akidi said.