Is there a time limit for a servicemember to "get over" or recover from a traumatic event?

I would say that there is a point where a person's innate resilience overcomes the trauma of the event and allows them to react more normally to everyday situations.
The event is not forgotten, but it is not spontaneously relived at every reminder.
It is the difference between being debilitated by the event and having it remain a memory.

I think it depends on the event and the individual, but I do not think that you can hang a timeframe on it and say that this is the point where they are "over it".

You never forget, sometimes flashbacks hit me out of nowhere. I am a lot better than I was when I first retired in 06, but sometimes I have my moments of depression. To say when to clearly get over it not sure. Time heals I suppose. Everyone has their different times and ways of overcoming adversity.

SGT S Sharpless I think there is a difference. There are some that insist on holding onto the anger, hate, or blame associated with the event. This isn't helpful, letting go of it doesn't mean one has to forget the event or to be unaffected by it.