I had my son singing the Marine Corps Hymn all 3 verses at 2 years old, never thought to tape it. I am a retard some times now he is to old and to shy to sing it in front of people.
My sons have several USMC outfits. When they come visit me at the office, my oldest (3yo) says "Daddy and Brandon are Marines." They're pretty indoctrinated. They also do pushups, pullups, side-straddle hops, etc.