I see Marines both wear blue and white pants for full dress uniforms. In which case they use which? : r uniformporn Did you know? The Marine Corps' Dress Blues is the only uniform in the U.S. military designated to include the red, white, and blue colors of the American flag. This distinctive uniform Sold at Auction: WWI US MARINE CORPS M1912 DRESS BLUE UNIFORM Original U.S. Vietnam War Named USMC Sergeant Dress Blue Uniform With International Military Antiques