...to add my tuppenth to Chainkicker and SilsoeSid's pension debate.
I am sure that when the AFPRB started to declare that military pay was abated to fund the pension scheme, around 1991ish, then it was ruled that the pension scheme was de-facto contributory. Therefore, making it illegal to deprive anybody being dis-honourably discharged of their pension since they had effectively contributed to it albeit not directly.
Perhaps somebody more in the know (Al R?) could confirm this.