We'll call it the Duck Effect. You thought you could out smart the system by asking not to be promoted but the AF needs 11Ms to fly and fill everything 11F/Bs can't be released. This gets you and others to 12 and if necessary with a strategic PCS to 14. At that point the AF can evaluate the force and conveniently at O-5. Some (not you) will choose to stay, or try to stay, possibly get passed over once (or twice) if we need to cull, and continuation to 20 to smooth things out. That gives the AF four or five opportunities to manage the force. The unfortunate reality is that unless everyone pulls a Duck, that O-5 decision point is going to be painful for people who should have left at O-4, are at 14-16 of 20, past the point of changing their retirement, and aren't continued.