Roland, this would be fine but I suspect that the sort of ex-servicemen who would be of greatest benefit to government really don't want to go anywhere near parliament (as has been mentioned). Moreover, the trend is for politicians to distance themselves from military service. It isn't too hard to imagine Lib/Lab types seeing any kind of military service (in their own career) as something of an anathema.
Torquelink, this would be a good start.