TOFO,
I have heard comments similar to those posted by pr00ne before, reference the number of ex military in prison, homeless, etc...
A very quick internet search produced this:
Why so many ex-soldiers end up in prison
If you go about the 7th paragraph it says that about 1 in 10 prisoners is an ex soldier.
A similar 1 in 10 statistic quoted here:
http://www.mirror.co.uk/news/uk-news...-after-2071049
How accurate these articles are, I couldn't say.