Yeah, H class requires level 1 certification from Tripoli or NAR. And for good reason I'd say. I just happened to launch an F-class yesterday - definitely not your kid-friendly little model rocket that you could launch from the baseball field nearby; that things goes far and carries quite a bit of mass. If something goes wrong and it shoots into a person, it could do some damage.

https://en.wikipedia.org/wiki/Model_rocket_motor_classificat...