Officers' rank insignia

General

Equivalent ranks:
RN - Admiral
RAF - Air Chief Marshal

Lieutenant General

Equivalent ranks:
RN - Vice Admiral
RAF - Air Marshal

Major General

Equivalent ranks:
RN - Rear Admiral
RAF - Air Vice Marshal

Brigadier

Equivalent ranks:
RN - Commodore
RAF - Air Commodore

Colonel

Equivalent ranks:
RN - Captain
RAF - Group Captain

Lieutenant Colonel

Equivalent ranks:
RN - Commander
RAF - Wing Commander

Major

Equivalent ranks:
RN - Lieutenant Commander
RAF - Squadron Leader

Captain

Equivalent ranks:
RN - Lieutenant
RAF - Flight Lieutenant

Lieutenant

Equivalent ranks:
RN - Sub Lieutenant
RAF - Flying Officer

Second Lieutenant

Equivalent ranks:
RN - None
RAF - Pilot Officer