Rank insignia of the Nazi-Wehrmacht, Luftwaffe (Air Force), here shoulder board, used during World War, until 1945:
Fahnenjunker-Unterfeldwebel, short: Fhj-UFw, Fj-UF (as to Unterfeldwebel, additional two 9mm silver-grey diamond-woven rayon NCO braids close to the end of the shoulder board)
corps colour: gold-yellow for Aviator troops: aviation pilots and ground personnel; parachute troops
today comparable: to NATO OR-5a.