How to Arm Entire Armies While Being A Professor (Null Route)

Imagine a new Professor just came into the most prestigious high school in the west. North Rayleigh Academy. When the professor's side-job is to be a world-renowned arms dealer for private armies. But this time what if you kept in touch with your past a very vivid touch with your horrifying past and embraced it once again

"Give an artist an inspiration... they'll make art. Give a student hope.... they'll thrive and be the best they can be. Give an army a stockpile of weapons... they'll create nothing but piles of bodies and mayhem along their path. I wonder sometimes if my students are actually listening to my lessons. I sure do hope they get more excited over science."
-Professor Vaughn Killford.