It depends on how the heavy weapons (big guns or BG abbreviation) wants to play. If its for PvP, build will be completely different than PvE (perks and special wise). Also traps are not worth it unless they will go locker hunting 24/7 other than that, don't tag it.
I highly recommend tagging first aid no matter what. Also there can't really be any "Medics" in Reloaded. Ashes of Phoenix medics work amazingly, its just the mechanics difference.
Anyways I'm going to assume you guys are some PvEers in TB so I'll suggest some builds to you.
BG build
Last 2 perks are up to the player. M60s work fine for PvE. They can take 2x action boy, or more ranged damage and Bonus ranged damage for more damage if they want to use avenger for PvE. I suggest not taking 3rd lifegiver because 20 extra HP is not really worth a perk out of 8.
As for your "doctor" you can do the same SPECIAL, except just tag whatever gun skill you'd like and instead of outdoorsman tag doctor. If you and your friend play together, you can mooch off his outdoorsman skill if you're in the same party.