F35 fighter pilots are not allowed to change hairstyles

You may wonder what the United States are doing with that mega super humungous military budget everyone knows they have. Well you got the cash to spend, you buy the best of the best in every facet, to the point where they spend so much on customised equipement, it puts pretty strict rules on the user! Kind of like when your parents bought a new car and you weren't allowed to eat snacks in the back for the first 6 months...