Hairstyles and haircuts shall present a professional and balanced appearance.
Appropriateness of a hairstyle shall be evaluated by its appearance when headgear is worn. All headgear shall fit snugly and comfortably around the largest part of the head without distortion or excessive gaps. Hair is not to protrude from the opening in the back of the ball cap, except when wearing a bun or Ponytail hairstyle. Hairstyles will not interfere with the proper wearing of headgear, protective masks or equipment. When headgear is worn, hair shall not show from under the front of the headgear.
Ponytails. The wear of a single braid, French braid, or a single Ponytail in Service, Working, and PT uniforms is authorized. The initial accessory for the Ponytail will not be visible when facing forward. Authorized accessory devices must be consistent with the color of the hair. The end of the braid or Ponytail may extend up to three inches below the lower edge of the collar of the shirt, jacket or coat. In spaces or environments where there are operational hazards such as rotating gear, etc., the hair may not be worn below the bottom of the collar.
More information on hairstyle standards and other uniform regulations can be found on the Navy Uniform Matters Website.