Naval dress uniforms hi res stock photography and images Alamy Vietnam War Era USMC Sergeant's Service Dress Blue Shade 2316 Wool Gab GRANDPOPSARMYNAVY 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 Uniform Care Guide Dress Uniform