Unlike some civilian career fields, human resources (HR) is found in all branches of the military. For me in the Army, it was the S1 shop, responsible for personnel support — that included pay, leave, awards, evaluations, personal records, event planning and promotions. In the civilian world, it’s pretty much the same, with the added duty of recruiting.
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.