Uniforms of the United States Navy Wikipedia According to the 1975 U.S. Navy Uniform Regulations, the rarely seen Service Dress Blue (Yankee) uniform was for "warm weather afternoon and early evening functions such as yachting parties." The uniform was Male Officer Service Dress Original U.S. WWI US Navy Gunners Mate Service Dress Blue Uniform Set International Military Antiques Navy Enlisted Service Dress Blue Jumper Bernard Cap Genuine Military Headwear & Apparel What uniform is this. : r navy