He’ll probably draw an Article 15 (nonjudicial punishment) and be administratively discharges.
*discharged.
As a light col, he is drawing pay from my taxes, and receives access to the best medical treatment {Walter Reed, etc.} and this dirt bag knows that boffing an enlisted man's wife is a military no-no.
If he were to go into real combat, he'd learn about Viet Nam fragging {not that it started there, but it more openly disclosed in Nam}.