If you are married and prior service, and you change your MOS, how long does the AIT have to be for your spouse to be able to move with you?

Unless the AIT is considered PCS, then she can't move at gov't expense. Also why move multiple times? You aren't going to spend much time with in AIT, and when you graduate you will probably be moved to a new post. It makes a lot more sense for her to sit still and visit, then move when you are assigned to your 1st unit.

PCS length AIT is 23 weeks or greater, or a multi phase AIT.

Is your AIT considered a PCS, TCS, or TDY enroute?