One of the persons you’ll not easily forget is your team leader, specifically the first one. This is because these team leaders will teach you a lot of valuable lessons that will hear you up for your deployment. Some of the best lessons you can get from them include knowing how to fight, understanding that ignorance can kill, and of course, believe in yourself. You can also learn from them that real Marines are forged in combat.
Source: https://www.wearethemighty.com/military-life/5-things-youll-learn-from-team-leader/