One who is in charge of the Physical Readiness and Training (PRT) program at your echelon, whose duties include looking up your shorts while pretending to count the number of sit-ups you're doing and caressing your waist as he lovingly slides the tape around your belly to measure its circumference.

When you eat dirt for the first time and leave your family to build a shack in the woods

A physical fitness fanatic in the military who believes that six-pack abs, blond hair, blue eyes, Teutonic good looks, and 12% bodyfat will ensure his suvival in combat, his promotion in peacetime and a place in Valhalla in the afterlife; everyone else who doesn't look like a recruiting posterboy should have been a candidate for prenatal eugenics.