What kind of U.S. Army uniform is this?

I think that the lapels are supposed to be maroon, as the pin he is wearing on his right lapel is the army medical regiment insignia.

Irishman: The pic you linked to is the army service uniform, which will soon replace the Class As, the Mess Blue uniform is a step above the ASU in dressiness

AmunRa: Members of different corps (Medical, AG, etc.) can be assigned to a medical regiment.