I understand that woofgang's answer may appear a little abrupt, but is essence, his answer is correct. The basis of army training is conformity - everyone must look and act the same, and individuality is no conducive to army routine. As far as women are concerned, a woman's hair is far more an integral part of her personality and self image, and making what is often a radical change to her appearence would be conteractively traumatic. It may seem sexist, but it is based on sound psychological principles for both sexes, and that is why these rules still exist. If you are the sort of person who questions rules and reasons, you may need to seriously question wether the T.A. is an organisation in which you are going to enjoy a happy and fulfilling career.