Wait till you have some credibility before you start investigating what you deem to be false claims.
Not to sound like a prick, but what exactly would entail having the credibility? I'm assuming that you would be referring to being a winged aviator before saying something?
If that is the case, then what gives reporters (or anyone) the right to investigate guys who might be frauds or anything like that (the case I have in mind is a guy who said he was a SEAL and had the MOH).
If that isn't the case, what would you think?
It's a sticky situation, b/c truly proving him wrong might mean a lot of research unless you were blunt and to the point and called him on it.
Either way, if he was just telling tales that might be something to let go, but if he is giving lectures and doing the stuff to promote it, including financially, I'd be one to look into it, tool or not. Too many people have fought and died to have random people claiming and reaping rewards for stuff they didn't do.