There was no immediate confirmation of his death from al-Qaida.
The Army confirmed the soldier was assigned to the 470th Military Intelligence Brigade.
He was among 200 surviving Montford Point Marines to be honored for their service in 2012.
All three were ordered to serve one year of probation.
Mattis charged that President Donald Trump has failed in his duties to the Constitution and the American people.
Army Secretary Ryan McCarthy told AP that the reversal came after Esper attended a meeting at the White House.
Airman First Class Natasha Aposhian, 21, and Airman First Class Julian Carlos Torres, 20, both died in the incident.
Currently, about 20,400 Guard troops have been activated in 28 states and the District of Columbia.
Brig. Gen. Harvey is under investigation for a matter that "does not involve criminal activity or safety," USAREUR said.