I have a soldier with a shaving profile who shaves his head. He comes into drill with just a beard. Is there a reg or is the soldier correct?

AR 670-1 3-2 Hair and fingernail standards and grooming policies
(2) Male haircuts. The hair on top of the head must be neatly groomed. The length and bulk of the hair may not be excessive and must present a neat and conservative appearance. The hair must present a tapered appearance. A tapered appearance is one where the outline of the Soldier’s hair conforms to the shape of the head (see scalp line in figure
3–1), curving inward to the natural termination point at the base of the neck. When the hair is combed, it will not fall over the ears or eyebrows, or touch the collar, except for the closely cut hair at the back of the neck. The block-cut fullness in the back is permitted to a moderate degree, as long as the tapered look is maintained. Males are not authorized to wear braids, cornrows, twists, dreadlocks, or locks while in uniform or in civilian clothes on duty.
Haircuts with a single, untapered patch of hair on the top of the head (not consistent with natural hair loss) are considered eccentric and are not authorized. Examples include, but are not limited to, when the head is shaved around a strip of hair down the center of the head (mohawk), around a u-shaped hair area (horseshoe), or around a patch of hair
on the front top of the head (tear drop). Hair that is completely shaved or trimmed closely to the scalp is authorized. (See figs 3–1 and 3–2.)
(a) Sideburns. Sideburns are hair grown in front of the ear and below the point where the top portion of the ear attaches to the head. Sideburns will not extend below the bottom of the opening of the ear (see line A of fig 3–1). Sideburns will not be styled to taper, flair, or come to a point. The length of the individual hairs of the sideburn will not exceed 1/8 inch when fully extended.
(b) Facial hair. Males will keep their face clean-shaven when in uniform, or in civilian clothes on duty. Mustaches are permitted. If worn, males will keep mustaches neatly trimmed, tapered, and tidy. Mustaches will not present a chopped off or bushy appearance, and no portion of the mustache will cover the upper lip line, extend sideways beyond a vertical line drawn upward from the corners of the mouth (see lines C and D of fig 3–1), or extend above a parallel line at the lowest portion of the nose (see line B of fig 3–1). Handlebar mustaches, goatees, and beards are not authorized. If appropriate medical authority allows beard growth, the maximum length authorized for medical treatment must be specific. For example, “The length of the beard cannot exceed 1/4 inch” (see Training Bulletin Medical (TB Med) 287). Soldiers will keep the growth trimmed to the level specified by the appropriate medical authority, but are not authorized to shape the hair growth (examples include, but are not limited to goatees, “Fu Manchu,” or handlebar mustaches).

This seems to be the key point: "If appropriate medical authority allows beard growth, the maximum length authorized for medical treatment must be specific. For example, “The length of the beard cannot exceed 1/4 inch” (see Training Bulletin Medical (TB Med) 287)."

http://www.apd.army.mil/epubs/DR_pubs/DR_a/pdf/web/tbmed287.pdf

Check the reg but at one time shaving your head would get you a artical 15

The reg is quite clear on both halves of your question:
- Shaving his head is perfectly acceptable.
- Any shaving profile MUST state the specific length of facial hair that is allowed. He must comply with that.

Bottom line: you can't do/say anything about him shaving his head, but you can check the profile to see how long is beard can be. Most shaving profiles are written for 1/4" but I've seen 1/2" written by doctors who want to be more liberal.