Blue Service Uniform Class B (Blues) Civil Air Patrol 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 DVIDS Images NMCSD DFA Holds a Service Dress Blue Uniform Inspection [Image 1 of 7] Cap Air Force Blues Women's Uniform Air Force Service Dress: French Twist Hair Inspection Day