Actually the British Armed Forces main effort is Peacekeeping. People who don't know the military only get to see Iraq and Afghanistan. There are more military personnel in other parts of the world than there are in full on combat zones.
I have been involved in one full on war - Iraq.
I have been involved in Actve Peacekeeping in Northern Ireland, Bosnia & Kosovo (ie patrolling streets, keeping order, issuing aid).
I have fulfilled peacekeeping and humanitarian roles (think floods, fires, strikes, riots etc) in UK, Kenya, Nepal, Cyprus and Turkey.
DH has had pretty much the same experiences, as have most of the people I know.
I don't know anyone that has only worked in Afghan or Iraq. Of course 'new' members may have, but that will no way be all they do during their careers.
I've never had to kill anyone - I've threatened to, I've aimed a rifle at a very bad man who was left in no doubt that I would kill him if he didn't let us go. But I did it for a very good, very sincere reasons and have no problem whatsoever in justifying my actions. If I had shot him I would have been investigated, interrogated, suspended and hopefull exonerated - killing is very much a last resort in most cases, trust me.
DH probably has. He was a tankie and a recce soldier. He saw more action in Iraq than I did and came under fire daily (hourly at some points). I don't ask. It doesn't define him. It doesn't make a difference to the person he is. He's also saved a lot of people.
If DSD or DD wanted to join the forces I'd support them - because it's their life not mine. I'd probably try to encourage them towards the RAF or Navy rather than Army, simply because I think the opportunities are greater. But ultimately its fuck all to do with me what career path they decide on. As long as they work and not doss then I'll support them.