What color shirt is specified to be worn under the ASU coat?

The correct choice is the Army gray shirt, which is specifically designated for wear under the Army Service Uniform (ASU) coat. This color is an integral part of the uniform regulation, designed to maintain a consistent and professional appearance that reflects the standards of military attire. The gray shirt matches the uniform's color scheme and provides a uniformity that is expected in ceremonial and formal settings. It is important for cadets to adhere to these grooming and uniform standards, as they enhance unit cohesion and display pride in the service. This regulation helps in providing a polished look that is compliant with Army standards.