Thanks for the chance to help. I am an attorney with over 12 years military law
I agree with you, the Marine Corps policy is broad. But I do not believe it is unclear.
I can also tell you (from my personal experience) that most Marine Corps officers tend to view potential fraternization. Basically, if it could be fraternization, it is for most Marine officers.
Not to say that they are always correct.
My point is that most Marines
, particularly Marine officers will view any relationship between an officer and an enlisted service member as fraternization.
Here is the Marine Corps policy
Personal relationships between officer and enlisted members that are unduly familiar and that do not
respect differences in grade or rank constitute fraternization and are prohibited.
That is pretty darn clear.
Unlike the Army, where they allow exceptions (like, for example, between active duty and reservists) the Marine policy includes everyone.
And this is consistent with the general opinion of most Marine officers that if it looks like fraternization, it is.
Now...there is one potential "loophole"
You mention IRR.
If you are truly in the IRR, then I do not see a problem.
The Marine Corps policy make the relationship criminal if they are between an officer and enlisted. Technically, a member in the IRR is not subject to the UCMJ (unlike reservists that are subject to UCMJ during periods of drill).
So if you remain IRR? Then this is a non issue
If you ever activate, you would need to end the relationship. Immediately. Or risk the Marine Officer's career
Let me know if you have more questions...happy to help if I can