Tanks for the Drawing!

Someone got bored doing homework, or at least that is what I am guessing is on the flip side of this lovely picture. A pen and markers were handy, so schoolwork is completely plausible. I'm no military vehicle expert, but I can't help but think there are a few too many guns coming out of this thing.

I adore finding hand drawn pictures in my books. How old do you suppose this artist was? Part of me says 9 year old boy, but wouldn't it be awesome to find out that father of that boy actually drew this while on some boring work call or something. Growing up shouldn't mean we stop doodling tanks when the urge grabs us.