First...stop thinking of that few month legal thing as a divorce. You may need to call it that when discussing legla things...but it was not real.
MAny MLCers return prematurely--I'd have been married and divorced and married to Sweetheart ^X had we let it go that far. The divorce was merely a premature return...it's not as complicated as you are making it sound...so you've been married for 18 years then...not 17 the first time and almost one this time.
As for the military issue--it's tough. I totally understand why you don't want to report it--given retirement and such.
BUT...he's reserve...so what else does he do career wise? What other sort of pension and retirement is available.
At some point you need to weight the rsisks. Sounds to me like he neds to reitre completely from the military--but of course that his his choice.
HOw long will the whore hang on...it depends.
First...no worries, she is obviously insecure and desperate. Educated or not, that's a typical OW...it won't last.
But MLC affairs can go on a few years.
I'm so sorry...but we can't tell you how long a desperate woman will persist...perhaps forever. If that is the case...it will be your MLCer that will need to make the break and not her.
LEt it Go. She will persist and this is what must happen for him to figure himself out...it's all part of the MLC process. So Accept amd have Faith that ewventually he will come out of this...better.