I am in my mid 40s and making a career change into nursing, so I have been around the block a few times (including prior military). I would agree with most of the posts here that advise to just follow the rules of the organization (school or workplace). Most places don't have outlandish standards and they are designed to present a professional image. In the big picture of things, haircut regulations seem kind of trivial to get all worked up over. Just an opinion, that's all.