History of the USN officer's blue yankee uniform? UNIFORMS U.S. Militaria Forum Original U.S. WWI US Navy Gunners Mate Service Dress Blue Uniform Set International Military Antiques How to Put Medals on Dress Blues for Each Branch USAMM 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 US Navy Enlisted Men's Dress, Blue, A & B Uniform