I'd recommend ditching the "US Army" tape too.
Don't you think that's taking it a little far? Maybe I would feel different if I have served, but I would wear a US Army tape to show my respect for those who have served and for that final touch on my uniform.
It's seems like we are taking this whole "you haven't earned it" thing a little far. Don't get me wrong, I agree on rank/patch but not even US Army? I have the absolute highest respect for those who have served but it seems to me this is a little much. Most backyard/part sport players often wear replica jerseys of their favorite player. Now, I am by no means trying to compare a basketball player to somebody who served, however I don't see them complaining about you not earning the jersey.
For most of us, airsoft is a sport. All he is doing is wearing the uniform that he respects most. I don't see why that is a bad thing. Once again, I can understand your point of view on the rank/patch but is it possible to pay my respects to those who have served without offending them? A good friend of mine just shipped out this week. He has gone airsofting numerous times with me. He could care less what you are wearing.
Plus, in this case, he's 15. I don't think ANYBODY is going to believe him if he says he served.
I'm not trying to disrespect those who have served, it just seems to me you are being a little touchy about this. Maybe I would feel different if I was in your situation. But I'm not, so this is the way I see it.