Joining military reserves while in college?

Depending on the MOS you choose, it is possible. Not sure if they still OSUT where your basic and AIT run together. Talk to people who have been in, make sure it is what you want. Recruiters will sell you the dream, not the reality. (Had some friends who are recruiters and not all are like this, but like sales, they are pushed to enlist certain numbers and different categories.)