Service Dress Blue (Yankee) uniform was for "warm weather afternoon and early evening functions such as yachting parties." The uniform was formally phased out in 2011 : r navy Halter Neck 2 Pieces High Low Backless Navy Blue Prom Dress, Navy Blue abcprom navy blue evening dress: Dresses For Women Dillard's Navy blue open neck evening dress US NAVY Male Officer Dinner Dress Blue Jacket Used 40 Regular (34 Sleeve) Black (USNA Flying Cross)