for gijoe - I can safely say you CAN receive (some) AFPS75 IP even after re-joining. As others have said, due to Military Salary not keeping up with CPI while I've been out, my expected full pension abatement actually became a £30 per month AFPS75 pension payment. The maths is that Re-joining Wage + £30 AFPS75 IP = less than my wage on initial retirement ADJUSTED FOR CPI over the intervening years. Just got to survive and serve to 60 to get the nicely building AFPS15 second pension. While we are talking about 'things you might not know about pensions' - important to realise there is a 2 year qualifying period for AFPS15. So if you do re-join and leave again inside 2 years, you get nowt for that period of service at state retirement age.