Cyberhacker,
Things used to be much more logical.
Pilot Officer - Commissioned Junior Pilot
Flying Officer - Organised the flying programme/duties.
Flight Lieutenant - Commanded a Flight
Squadron Leader - Led a Squadron
Wing Commander - Commanded a wing
Group Captain - in charge of a Group
Air Commadore - Supervised the Fleet.
Air Vice Marshall - Made sure that the strippers arrived on time....
However, since the advent of Green Shielders, and rank connected pay, we all went up one ( rank that is - not the strippers).