Battle Dress Uniform
U.S. military police used to be distinguished by a brassard worn on the left arm when on duty in previous uniform versions such as the Battle Dress Uniform. The brassard was black with white lettering for garrison law-enforcement duty and could include extra designations such as "Customs MP" or "K-9 MP" (for dog handlers). Tactical brassards were green with black lettering for temperate climates and sand with light brown lettering for desert duty.