Civilians are not to be respected.
Civilians must be considered Equals, and addressed as Sir or Ma'am.
RAF Command, Officers, Enlisted?
RAF Command, Commissioned Officers, Non-Commissioned Officers, Enlisted?
RAF Command, Officers, NCO's.
The chain of command is the line of authority and responsibility along which orders are passed within The Military and between different Divisions.
It is the way of who you should contact for needs.
It is a long golden chain which the Pimp of the Royal Air Force wears at all times.