I highly doubt the personnel your friend saw were medical students; they were probably other USUHS-assigned personnel, or the TV news people got their terminology mixed up. There is absolutely no value added by deploying medical students to a theater of operations. There are plenty of people they can still tap in the Active and Inactive Reserves (knocking on wood) before they need to yank med students.
That being said, there are lots of reasons why USUHS-assigned personnel might "go overseas". Students may just be going to Landstuhl RMC for a rotation. It's possible some 3rd/4th years are visiting Afghanistan for 2 weeks to see level I and II care in theater. Some of the graduate nursing students may still be PROFIS to deploying field hospitals. Alaska and Hawaii are considered OCONUS; when I was stationed in AK, we had USUHS students there in the summer attempting to earn their EFMB's. Worst case scenario would be, I think, is if SOCOM is hurting <<really>> bad for former SOF personnel, and USUHS students of that background are volunteering.
This above is all just speculation (75% of SDN posts by my reckoning 😉 ), but if you're USUHS bound, I think you can be confident they won't be handing you an M-4 and telling you walk point anytime soon.