Which is NOT an authorized hair arrangement for female Soldiers?

The choice indicating that hair allowed to hang past the shoulders is not an authorized hair arrangement for female Soldiers is correct because Army grooming standards are designed to ensure a professional appearance and maintain uniformity among Soldiers. According to the grooming standards, hair must be arranged in a way that does not impede the proper wear of headgear and is kept off the face to present a neat appearance.

Hair that hangs past the shoulders can be disruptive in operational environments, especially where safety and functionality are paramount. In contrast, authorized styles such as single unbraided ponytails, two parallel braids, and single braided ponytails comply with regulations by keeping hair secured and preventing it from interfering with the Soldier's duties. These styles are practical and maintain the professional standards expected within the military framework.