The "what about the..." argument isn't the issue here. Just because we of the Armed Forces are having our pension arrangements systematically erroded doesn't mean it's right. And it is certaily not an argument for doing it to anyone else. Yes, the story behind each case is to be considered, but "we're getting stuffed and we can't do anything about it" doesn't make right for others to suffer the same fate.
By all means offer new conditions and pensions to people joining today, but taking pension rights away from those that have already been earning them... ...sorry, it's not right.
These are people that have earned their pensions through good service - either saving lives or defending our freedom (just two examples, I know). Let's spend more money on giving money, houses, education, healthcare and human rights to people that have never contributed anything to the country instead. Really?