Drill sergeants receive specialized training to project their voices effectively and safely. They learn techniques like diaphragmatic breathing to command attention and protect their vocal cords.

The use of yelling in military training dates back to ancient armies. Psychologically, it serves as stress inoculation, preparing recruits for the intense and chaotic environment of combat by exposing them to controlled stressors.

The speaker shares a personal experience from a deployment in the Middle East, illustrating how stressful training situations can enable calm, collected reactions in real-world emergencies.

Beyond stress inoculation, yelling establishes authority, especially when dealing with challenging individuals. It also creates a sense of urgency, prompting faster action during critical moments.

The video concludes noting that the yelling subsides after basic training. The speaker highlights that as the military is currently volunteer-based, individuals willingly choose to undergo the process for their own development.