CSAF defers heritage coat decision, focuses on current uniform issues > Peterson and Schriever Space Force Base > Display If you wear the Marine Corps Dress Blue uniform for the upcoming 247th Birthday celebration, Toys For Tots campaigns, or any other activity, please adhere to the Marine Corps Order 1020.34H. This Dress Blues Explained The Dress Blue uniform, worn by Marines, is steeped in history, with roots dating back to 1798 when the secretary of war authorized the wearing of a blue uniform Marine Corps Uniform Regulations: Tips & Advice for Appropriate Wear USAMM Cadets trade ACU's for dress blues The George Anne Media Group