How should I proceed if I know about an inappropriate relationship between a single sailor and a married woman?

Let the chips fall where they may. Stay out of other peoples marriage problems.

SSG,

Your heart is in the right place but this is not your fight or a road you should go down. If your troop doesn't have definitive proof she is cheating then all he has is his wife talking to another man. This is not a criminal offence.

Flip the script, say you were contacted by a Navy Chief saying one of your Troops may or may not be shagging one of his sailors wife and he wants you to put a stop to it or throw the UCMJ at the offender... What would you say? "What proof do you have?" That's going to be the question, while I hate people who cant stay faithful to their spouse, at the same time all you have is third hand accounts and possibility's, direct your Troop to the Chaplin get him and his wife some marriage counseling or let them decided to get a divorce. But getting involved in personal matters doesn't end well for ALL parties involved.

Again your hearts in the right place and I understand but slow your roll till you know all the facts. just my advice.

As I read through the previous comments on this post, I see a lot of "just look the other way" and "itd none of your business". THAT IS BS. we are a professional organization that prides itself in honor and integrity. If you have a servicemember under your authority who is suspected of violating the UCMJ you have an obligation to take action. We are leaders; Act like it.

If there is an accusation to be made of actions not in line with regulations or good order and discipline within a chain of command - try the IG. You are a third party so I recommend your Soldier visit with them. They are responsible to handle accusations within a GO/FO's command. Anyone can make an accusation; the IG can sort out if the allegation is appropriate and what the Soldier's and his commander's courses of action are.

Mind your business and let the chips fall where they may.

Here's my issue, is it inappropriate for one service member to get with another's wife yes.

Should you lose a career? Only if your using your rank ite position to do so. If she's running to him and him to her.

The Soldier needs to make a course of action.

Figure out of he wants to stay married of so pursue counseling.

If not find a lawyer.

What is your role? Support him and let him know you'll be there if he needs anything.

Other than that those are adults doing adult activities nothing ILLEGAL. immoral yes, illegal no. Except in the military where it doesn't apply to the commander in chief

It’s an easy way to prove if she is having a relationship with this guy. A private investigator could help. Today, EVERYTHING you do with electronics has a signature and can be found. I’m not sure of civilian law, but, you can get the sailor in trouble by submitting this information to his chain of command. I had an incident where a soldier was brought in front of his company commander about an affair he was having with another soldiers wife. This soldier was able to prove that he did not know this woman was married. He was instructed to severe ties with this woman. He actually got two witnesses to accompany him to see this woman at her work and told her not to contact him again. As far as your soldier that you are trying to help, he should seek outside legal representation and Institute a divorce. No sense in trying to save this marriage if she is seeking outside male companionship.

Tell your soldier to divorce her, as she is the scumbag

That's tough. I'd contact the sailor and let him know she's married and to back off. Then his CoC

Why don't you stay the fuck out of other people's business. This is between a PRIVATE CITIZEN and a single sailor whom you have NO AUTHORITY OVER. You fully state in your question that all you have is heresy as evidence. Stay the fuck out of it and mind your own business. Its not about you.