Halter Neck 2 Pieces High Low Backless Navy Blue Prom Dress, Navy Blue abcprom Elegant A Line Open Back Navy Blue Long Prom Dress, Long Dark Blue For abcprom Navy Blue One Shoulder Prom Dresses With Slit, MP941 Musebridals File:DN SC 85 02753 U.S. Navy officer in tropical dinner dress blue.jpg Wikimedia Commons U.S. Naval Reserve c1923 Cadet's "Evening Dress, Blue" Jacket 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