Who can authorize soldiers to grow facial hair for non-medical purposes?

The correct choice highlights that appropriate medical personnel have the authority to authorize soldiers to grow facial hair for non-medical purposes. This policy is established to ensure that any allowances for alterations in appearance, including facial hair, are made considering the individual's health and safety, while also adhering to military standards and regulations. Medical personnel are qualified to evaluate any specific personal circumstances that may warrant such exceptions; hence, they hold the necessary responsibilities for making these decisions.

The other options, while relevant in different contexts, do not hold the specific authority designated for this situation. Division commanders typically have broader operational control and may influence uniform standards, but they do not specifically authorize facial hair exceptions for non-medical reasons. Unit first sergeants and immediate supervisors manage day-to-day operations and may have some discretion regarding grooming standards, but final decisions regarding non-medical facial hair allowances rest with healthcare professionals who understand the implications of such changes on a soldier's well-being.