If a male soldier's hair is long enough in accordance with AR 670-1, is he allowed to wear his hair in a hair tie?

If a males hair is long enough to be tied then it’s not in accordance with 670-1.

From my look at the regulation, AR 670-1 only authorizes the use of hair devices under the section covering women's hair. It makes no mention of it under men's hair. So, in the absence of it being explicitly authorized for men, it would be unauthorized. Everything is covered in Chapter 3-2.

First...no. You can't in uniform. If you want to bun your hair in civilian clothes...sure. I'm one of those classic types that believes you shouldn't have a man-bun unless you're strapping a samurai sword and live in the 1300's, but whatever. This hair style will be dead in less than 5 years anyhow. My biggest concern is that something that requires hair product is not conducive to combat. If you have to cart around hair gel to the field, in a real combat situation...you're going to run out or be forced to carry a duffle bag full of the crap.