Insignia
The rank insignia consists of two narrow blue bands on slightly wider black bands. This is worn on both the lower sleeves of the tunic or on the shoulders of the flight suit or the casual uniform. The rank insignia on the mess uniform is similar to the naval pattern, being two band of gold running around each cuff but without the Royal Navy's loop. Unlike senior RAF officers, flight lieutenants are not entitled to fly a command flag under any circumstances.
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An RAF flight lieutenant's sleeve/shoulder insignia
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An RAF flight lieutenant's sleeve mess insignia
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An RAF flight lieutenant's sleeve on No. 1 service dress uniform
Read more about this topic: Flight Lieutenant