Does fraternization cross branches?

The answer is no. Unless the chain of command includes both of you, conflict of interest is involved.

If you are in a pre existing relationship then there is a 1 year grace period from commissioning.

I know this thread is in fact old but in case anyone comes across hoping to find an answer. The truth is, I have done extensive research on this topic given my past and present experience with dating in the military. The answer is, given the preexisting relationship you will not receive any punishment. Both parties will be consoled on there relationship and told there options. These options include marriage within 1 year or terminate the relationship. After the year is up that is when things get hairy so speak.

We both had contacted our commands prior to getting married and had the go a head.

Any command activities we attended, the person who was in the command was the one that was in uniform and was addressed by rank and the other was the spouse.

I first knew my wife in eight grade and then met her again at my cousins wedding reception when I was a second class petty officer. She was in nursing school. When she finished nursing school, she went to Officer training and became a Navy nurse.

When she heard I was going to get stuck on the carrier and not be able to make the wedding, one of the other nurses that she worked with told an Marine General who was a patient of hers in the hospital. He contacted the ships CO and suggested that for the Moral and common good of the combined services', he would appreciate anything that my CO could do to insure that I made it home in time to make the wedding.

We still have the framed letter as a memento after 442 years of marriage.

At the time, we were told that there was no problem as long as there would not be any "NO POSSIBILITY OF SUBORDINATION IN THE CHAIN OF COMMAND!"

There must have been a lot of changes since I retired. At that time it was considered fraternization only if one was in a position to influence the promotion, pay or career of another. There may have been more to it but that was the main consideration.

I had a PLT leader who had a pre existing relationship with an enlisted marine. Once she got her commission they were given something like a year to marry or dissolve the relationship. Pre existing allows for it but there is a time limit. You would have to check with jag on the exact time limit though.

This will vary by branch, and I'll say the Marine Corps is the strictest when it comes to fraternization. For example, if an officer candidate is dating an enlisted servicemember of any branch they must be married before the candidate arrives at Brown Field or the USMC will consist anything after to be in violation.
The issue is, all branches have different regulations when it comes to fraternization. Like someone said, check with your JAG Officer as they'd be able to best answer this.

My advice: this can go many ways. Don't listen to 'barracks lawyers." In the end, a commander has many options - anywhere from turning a cheek to courts martial. Talk to your JAG and see what they say - and what the going rate is at your base these days...trust me - that matters...