I don't see why not, but as mentioned before, it depends on the country. We have it where I live, and though I'm not sure of all the details, I think the system is pretty flexible.
As far as I know, it's compulsory to spend a year in the military for all men that has turned 18, but you can opt to do civil service instead, which can be working at schools or kinder gardens or something similar. You're not allowed to do military service if you don't meet certain demands, like if you're very near sighted (I know because my father wasn't allowed to do service for that very reason). You'll be allowed to finish education you've started, but I'm not sure how things are about jobs. Also, you can opt out if you're a pacifist. Women doesn't have to do the year, I believe (though the rules may be changed soon), but a lot still join up. I would have, if I hadn't had problems with injuries and asthma.
I'm pretty sure the ones who do the year aren't sent into real combat at all, but I know they're put through drills and combat practice. Through friends and family, I've heard stories about everything from long combat simulations in the forest in the middle of the winter, periods of four hours of sleep a night and being so tired you can barely follow orders, to spending a night off in the closest town, practical jokes in the barracks, and the night shift as a watch. It's not all bad, and everyone I know got a lot of good things out of it.
Oh, and you can get free education. From getting a license to drive trucks, to becoming a freaking engineer(if memory serves), though the latter obviously takes more than a year, and there's strings attatched.
So, yes. I support CMS. When it comes to the system in my country, at least.