Chief Petty Officer
From Air Cadet Central Wiki
Chief Petty Officer is a Non-Commissioned Officer (or equivalent) in many navies.
Royal Navy
In the Royal Navy, the rank of Chief Petty Officer comes above that of Petty Officer and below that of Warrant Officer Class 2. It is the equivalent of Colour Sergeant in the Royal Marines, Staff Sergeant in the Army, and Flight Sergeant in the Royal Air Force.

