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 the Marine Corps Band. This distinctive red coat is part of the Marines' ceremonial uniform and symbolizes a proud tradition within the Marine Corps. The Marine Corps Band, known as "The President's Own," not only supports the Marine Corps but also performs for the President and represents the United States through its musical performances. The unique design of the red coat reflects the historical uniforms of the early American military, and it has come to be recognized as an iconic element of the band’s attire.

Other branches mentioned, such as the Army, Navy, and Coast Guard, do not have red coats as part of their standard uniforms. Thus, while they might have their own ceremonial dress uniforms, the Marine Corps Band uniquely features the red coat, linking it directly back to American military heritage from the Revolutionary War era. The accuracy of this connection to tradition and ceremonial purpose reinforces why the Marine Corps Band is the correct choice.