I believe only during wartime and it's only if you volunteer, and of course you have to be qualified. At least that is for the Senior Military College's, so I'm not sure about your situation. :/
I agree with the above posters. If you look at even Gulf I and the early part of Gulf II, they did not pull cadets.
Now, that being said, I don't know how it would work for those cadets that are also enlisted with a guard unit. However, for the traditional cadet I doubt they will see any impact at all, except for maybe class discussions.