This soldier is currently in Japanese custody, not American.

I was stationed at MCAS Futenma on Okinawa. The US shows no mercy when it comes to crimes against the local residents. Usually the Japanese legal system gets them first then after they spend time in Japanese prison they face the military legal system. We get a whole week of classes when we first get to the island about Japanese culture and they make sure to impress upon how fucked you will be if you cause an international incident. Even minor offenses such as underage drinking are dealt with very harshly. There were two Marines from my squadron sent to Corrective Custody Unit for drinking underage at an off limits bar.

Typically getting court marshalled comes with time spent at Leavenworth

This soldier won’t see real repercussions for this. At worst he will he courmarshalled and get a dishonorable discharge and nothing else.

Uh… A court martial is typically equivalent to a felony. If you’re found guilty it’s often associated with prison time and civilian felony statuses.