At least he’s doing something with his engineering degree.
There has to be some sort of military application for a gun that makes and shoots paper airplanes. An entire army equipped with paper-airplane guns would dominate the battlefield. I suspect that enemy troops would become so disoriented from the constant barrage of little pieces of paper they would throw down their weapons in disgust and go home. If that doesn’t cause them to flee their position in terror, we could start launching other papier-mâché eggs and small paper animals.
If that doesn’t work, we’ll break out the flamethrowers and then we’ll see how much they like being covered in paper airplanes.