Kudos to the US Army. I have never met a Sikh that was not an honorable person, and I've had dealings with quite a few. As for the long hair, Sikh culture states it must be well-maintained and kept. The turban covers the hair.
As far as whether or not this is a good thing, I'm all for it.
And I agree with others out there, that turban looks awesome!
Ditto