While he probably did recieve basic training, he was in the medical corps. Being an army doctor is different than being on the front lines with a gun in your hand.
If we stretch things out like this, you may as well rule out every character whose ever hunted because they're trained to use a gun (or bow, depending on the time period). We won't have anybody left then.
Okay, that's a little silly.
"You should shoot him in the heart, it's his weak point! I know, I'm a heart surgeon!"
"Kick him in the groin, that'll stop him! Trust me, I'm a urologist!"
"If my years as an optometrist have taught me anything, it's that you can blind a man by poking him in the eyes!"
"Fellow ninja, be careful! That man is a trained pediatrician! He knows a thousand ways to kill us!"
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I think the precendent that the OP is looking for is that of the non-heroic character, placed in heroic circumstances.
This is another one of those things that make me wonder where the OP is going with all of this. Does Gabrielle from Xena count? She certainly starts out with no skills, but over the course of the series she learns to fend for herself. Do skills gained in the field disqualify one?
The assistants to Dr. Who are excellent examples, but isn't there the implication of a sexual relationship off screen? I only know the recent series, which had a wonderful episode with a former assistant, so...
Odysseus had the aid of the gods at times, but he was certainly out of the class of Agamemnon and Achilles. Perhaps that swineherd that aids him when he gets back?
Ripley's possible, although I'd have never thought of her as ordinary.
The Lone Gunmen? Possible. Do they ever take the field?
The assistants to Dr. Who are excellent examples, but isn't there the implication of a sexual relationship off screen? I only know the recent series, which had a wonderful episode with a former assistant, so...
Yes he did and he apparently managed to hold his own against fully grown adults, without even a shield like Cap.Doesn't Rick Jones get combat gymnastics training from Captain America?
No greek hero can possibly be considered a "normal" person. While he did piss off a number of the greek gods, he was also favored by several of them, Athena in particular. IIRC.Odysseus had the aid of the gods at times, but he was certainly out of the class of Agamemnon and Achilles. Perhaps that swineherd that aids him when he gets back?
Ripley's possible, although I'd have never thought of her as ordinary.
The Lone Gunmen? Possible. Do they ever take the field?
No greek hero can possibly be considered a "normal" person. While he did piss off a number of the greek gods, he was also favored by several of them, Athena in particular. IIRC.
You can't consider Xander a normal person either. As far as Greek heroes go Odysseus was about the most normal of any. While others were unkillable or part god, Odysseus was a true mortal who was captured many times, afraid to die, and survived for the most part on his wits. His struggles were not for any grand heroic purpose, he just wanted to be home with his wife. While Odysseus is not a 15th level commoner, he is probably a 15th level Aristocrat but an NPC class nonetheless.
Edit: It could be considered as well that he started of as a sidekick and was eventually given his own spin-off show. It is in the Iliad that he first appears and is secondary to Achilles, Agamemnon, and Paris. It was only later that he made a name for himself in the Odyssey.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.