 Before 1998, certain ceremonial Marine units, such as the Silent Drill Platoon, wore a blue/white dress uniform in which white trousers were substituted for blue while performing ceremonial functions.The blue/white version is now an authorized summer uniform for officers, SNCOs, and on certain functions, NCOs.The Marine Corps Mounted Color Guard currently wears the blue dress coat with white riding breeches and polished black knee-high riding boots although in the past they have worn blue riding breeches with the red blood stripe.