That's a very ignorant view of the Forces, actually. Having a paid army is not "realpolitik"; nor is the army stuffed full of people too poor and thick to do anything else. This is the kind of opinion I had as a 14-year old being forced into CCF at school. Are you really going into international development with half-formed attitudes like these?

yep, ad hominem attacks is where it's at on this thread.
I briefly thought I'd got the terminology wrong, but just checked and realpolitik still seems to refer to "politics or diplomacy based primarily on power and on practical and material factors and considerations, rather than ideological notions or moralistic or ethical premises." So...
A paid national army is in the pay of the state, and therefore acts according to its bidding (as the police do internally, regardless of their own political views). Since realpolitik dictates that most of what the state bases its decisions on is power-economic rather than ideological, then the army will be upholding these values, rather than vague notions about 'democracy' or 'national defence'. No?
As I understand it, veterans of Iraq joining up with OSX expressed exactly the opinion that they were there to clear the way for big business, rather than anything more ideological, but then, obviously they have 14-year-old opinions too. I'll find the article(s) for you later, if you like.
No, of course the army is not
only full of poorer sections of society, hence the qualifier 'mostly'. And I never said people in the army were 'thick' (which leads me to suspect you have personal investment in this, which is usually the reason one comments on what what one wants to have been said, rather than was actually said - we've all done it). But is it untrue that many join up because the army offers other benefits (good salary, paying one's way through university), and better job prospects? I'm reading a book that touches on this point right now, in fact. Feel free to dispute this point, but denying that this is a moot point is just foolish.
If you have personal interests in this (eg one of your family is in the army), just declare them rather than being personally insulting, please. It's mystifying and boring more than anything else.