Paint pellet gun

Introduction
The Paint Pellet Gun is a UNSC weapon that fires small pellets filled with paint.

Uses
The Paint Pellet Gun was used by CPO Mendez and drill instructors to train the Spartan-II's on the agricultural planet, Reach. It was used to snipe the Spartans in parade drills to teach them a lesson that things would be twisted, and unpredictable.

Service
It was probably only used in training when they were young, 6, 7, 8, 9 years old.

Speculation
It was only mentioned in one place, but it's highly possible that Mendez used them in other lessons and missions.