See Moot, for me it's a very basic equation...
Would you rather be cynical, or gullible?
Personally, I'd rather be a cynic, and draw the line of plausibility somewhere outside of the story as presented above. That way, I risk not believing a narrow band of stories of questionable plausibility that wind up, against the odds, being true.
15 year old + 2 larger assailants + heroic victory over such assailants + young girlfriend waiting at home, WITH parents = Voss
Next week he'll be defusing a bomb at school
The week after he'll be admitted early to the Airforce
The week after that he'll be flying a mission to the Middle East to rescue his dad, with Lou Gosset Jr. as his wingman.