Yes you can get a court martial for it. I was in the Navy and maybe 10 years ago there was a story on the news about a woman in the Air Force who was given a General Discharge rather than an Honorable Discharge because she was dating a married man. She didn't know he was married, but she still got in trouble for it. In boot camp I remember reading in the code of military justice that you could get in trouble even if you don't pay your bills since paying bills on time is written in the cmj.