The issue with paintball in particular is that it can (and does) cause actual harm when you are shot. Anyone who has been paintballing at a centre with tell you, they come back with various bruises. Yes the centre is insured and has qualified staff etc… but the ATC is who will have the angry parent with the kid covered in bruises, because his mates thought it was funny to " light him up" in the middle of a game. I’ve seen it happen at paintball sites before (not with cadets), it’s kid’s nature to mess about.
Laser tag is a better option, as it doesn’t involve physical contact from any form of projectile.