Let down your hair: New Army rules for ponytails, nail color
US Military and beards: Does facial hair really break a gas mask seal?
Why can't military personnel grow a beard? What is the science
The Chevron Mustache: How to Trim, Shape, and Maintain
Why are beards allowed in the military while mustaches are not
The Definitive Guide to Mustache Styles – Beardbrand
Space race for an identity: Why the Space Force needs beards
Air Force may allow another dash of 'stache
Air Force beard policy is actually damaging airmen's careers