Relative Rank In The Services

Royal Navy	Army & Royal Marines	Royal Air Force
Admiral of the Fleet	Field Marshal	Marshal of the Royal Air Force
Admiral	General	Air Chief Marshal
Vice-Admiral	Lieutenant-General	Air-Marshal
Rear-Admiral	Major-General	Air Vice-Marshal
Commodore (1st & 2nd class)	Brigadier	Air-Commodore
Captain	Colonel	Group Captain
Commander	Lieutenant-Colonel	Wing-Commander
Lieutenant-Commander	Major	Squadron Leader
Lieutenant	Captain	Flight-Lieutenant
Sub-Lieutenant and Mate	Lieutenant	Flying Officer or Observer
Commissioned Officer from Warrant Rank	Second Lieutenant	Pilot Officer