Interestingly, those MPs who served (Healey, Benn, Heath, Neave etc etc) were those who were the most anti-war of the lot.
As we now have a generation who didn’t fight in real situations or do National Service, it’s a bit more theoretical. And we have people who are perfectly happy to take us to war** based on poor information and a desire to please their allies, rather than slightly more authentic politicians who would exhaust every possible alternative before reluctantly bowing to the inevitable.
Put it this way, if someone who had actually served told me that war was, sadly, completely unavoidable, I might listen and feel more like agreeing to be conscripted. Paddy Ashdown, regardless of what you think of him politically, has credibility in this area in a way that Cameron & Clegg could never have.
**Yes, I do mean you, Tony Blair.