No.
His attitude, his ultimate loyalty is to the enemy. In battle, who will he attack? How will he attack, how will he deploy his forces? How many will he kill - on our side?
HE WILL KILL American soldiers. NO, he did not “make a mistake.” He MUST be removed. Imprisoned for the duration of his “obligated service”? It is appropriate.
his admission sows distrust in the ranks and had to be intentional. Admissions departments built classes each year. Letting these types in seems designed to break unit cohesion.