Been in the ANG for almost 26 yrs and we have never used the terms IPZ or APZ, at least not in our OG. Position Vacancy is used for an “early” promo. Other than that, it’s typically when a promo packet is put up or you meet ROPMA. Each unit handles their promo timelines differently. We have hired many folks off AD (from USAF, USN, USMC) that had been selected for next rank, but hadn’t pinned, that ended up having to wait to get promoted. Leadership has to think about Force mgmt-how you fit into unit rank structure, how it affects other folks, how long you plan on staying in the ANG. It is very different than AD and there are only so many positions.