Who wears the only red coat worn by American forces since the Revolutionary War?

The only red coat worn by American forces since the Revolutionary War is indeed associated with members of the Marine Corps Band. This distinctive uniform symbolizes the ceremonial and musical traditions of the Marine Corps, dating back to its historical roots. The red coats worn by the Marine Band are an iconic representation of Marine heritage and serve to promote the unity and pride within the Corps and the broader military community. The Marine Corps Band's role is not just limited to providing music; they also participate in ceremonial duties and various public engagements, where the red coat is an essential part of their formal attire.

While other branches of the military have their own unique uniforms and ceremonial attire, the distinct red coat remains a hallmark of the Marine Corps Band specifically, making it the correct answer to the question.