Elegant A Line Open Back Navy Blue Long Prom Dress, Long Dark Blue For abcprom A Line One Shoulder Satin Beads Dark Blue Long Prom Dress, Blue Long Evening Dress US 4 Custom Color 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 Navy Blue dinner dress Navy Blue Mermaid V Neck Rhinestone Prom Dresses, MP943 Musebridals File:U.S. Navy FMF corpsman in dinner dress blue jacket uniform, 2016.jpg Wikimedia Commons