Unlike the robust recruitment efforts of World War I and World War II, recruitment today is more focused on maintaining a standing military. As such there’s more emphasis on character, skill, and career development instead of a call to arms in response to a specific threat.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.