“I hand out a number of compliments, and all of them are designed to be unexpected,” said Sergeant Dennis Joy, a thoroughly intimidating drill instructor who showed me around the Recruit Depot one day. “You’ll never get rewarded for doing what’s easy for you. If you’re an athlete, I’ll never compliment you on a good run. Only the small guy gets congratulated for running fast. Only the shy guy gets recognized for stepping into a leadership role.”