I have no problem believing a medic could be an amazing soldier. There are medics on SEAL teams, Tier1 teams, SAS ect. ect. ... I would hazard a guess and say that many of the most elite soldiers/teams on the planet all HAVE to have some introductory level of first aid/medicine before they are allowed on the team. He could easily have been in med school before joining whatever local para military group that BB yanked him from with a balloon and taught the dude CQC just like all his other soldiers and so on and so forth...
That's realistic enough. That's viable. That is not what people are having trouble swallowing.
What is bullshit - and makes no sense given what we know of BB and even Snake/Liquid/Solidus (given they are genetic clones) is that this rank and file everyday soldier who you at one point knocked the fuck out and hitched a balloon to his pants, could adequately fill the role of Big fucking Boss. The Legendary/Heroic once in multiple life times kind of soldier. He has done AMAZING things, pushed his mind and body beyond what normal men and women could ever dream. There is a reason behind soldiers who have never met the man, are actively working for the other side and don't even speak his language adore the man and fall into his employ without much convincing.
It's because BB is supposed to be the iconic ideal and zenith of what a soldier is capable of. He is legendary. He's Big. Fucking. Boss.
But apparently... so am I and so are you. And so is that jerkass from my high school who never brushed his teeth. And so is this completely un-important and completely unknown soldier.
It's fucking lazy and stupid.
But yes - medics go on missions. You've got that point going for you.
edit:
Pump. Those. Brakes.