I'm with Sasino on this one. Such a feature should be reserved for another future class addition.
-1.
If you need armor in somewhat of a hurry, there is always /supply drops that you can use to replenish it.
(there's plenty of free armor pickups around the map and also ammunations where you can buy armor from)
Rank 1 or Rank 10 medic, doesn't matter, medic's are their for health related reasons, nothing to do with everyone saying +1 or thinking it would be more convenient, more to do with the logic behind their actual role on the server.