Shiny A Line V Neck Navy Blue Backless Prom Dresses, Open Back Navy Bl jbydress 2 Pieces Navy Blue Prom Dress, Dark Blue 2 Pieces Formal Dress, Evenin jbydress 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 A Line One Shoulder Satin Beads Dark Blue Long Prom Dress, Blue Long Evening Dress US 4 Custom Color