| Males |
Hair style will have a tapered appearance on both sides and back, both with and without headgear. A tapered appearance is one that when viewed from any angle outlines the individual’s hair so that it conforms to the shape of the head, curving inward to the natural termination point. Block cut permitted with tapered appearance.
Hair will not be worn in an extreme or fad style or in such a way that exceeds length or bulk standards or violates safety requirements. Will not touch the ears and only closely cut or shaved hair on the back of the neck may touch the collar. Will not exceed 1 1/4 inches in bulk, regardless of length and not exceed 1/4 inch at the natural termination point. Will not contain or have any visible foreign items attached to it.
Sideburns will be neatly trimmed and tapered in the same manner as the haircut. Will be straight and of even width (not flared) and end in a clean-shaven horizontal line. They will not extend below the lowest part of the exterior ear opening. (This does not apply to individuals with shaving waivers.)
Mustaches will not extend downward beyond the lipline of the upper lip or extend sideways beyond a vertical line drawn upward from the corner of the mouth. (This does not apply to individuals with shaving waivers.)
Hair will be styled to present a professional appearance. Plain and conservative pins, combs, headbands, elastic bands, and barrettes similar to the individual’s hair color permitted to keep hair in place.
Hair will not be worn in an extreme or fad style or violate safety requirements. Will not extend in length on all sides below an invisible line drawn parallel to the ground at the bottom edge of the shirt collar at the back of the neck. Will not exceed 3 inches in bulk or prevent proper wear of headgear. Will not include hair ornaments such as ribbons or jeweled pins.
Nail polish may be worn if it is conservative, single color, and in good taste. Nail polish will not contain any ornamentation.
Cosmetics must be conservative and in good taste.
Air Force Instruction 36-2903
In the US military, you must adhear to the haircut standards of that branch. You are serving to protect a democracy, not to practice one. If you cannot live with those standards due to your religion, then you do not have to join.
As for the Airforce, from what I have seen it has the most lax haircut standard out of all the branches.