No squadrons on the records?

Wartime RAF Records of Service only contain brief details,
such as in the ‘Unit’ columns where units (Commands, Groups, Wings, RAF Stations, Squadrons, and Miscellaneous units) were noted,
but not where an individual stayed, or details of training.

Also, not every member of the Royal Air Force was Posted or Attached to a Squadron (as well as flying squadrons, such as No. 5, No. 29, No.108, No. 220 etc, there were also ground units - for example, Balloon Barrage Squadrons, and Airfield Construction Squadrons).

Personnel of all Ranks and Trades (Pilots, and non-aircrew like Drivers, Cooks, Clerks, Electricians, and Flight Mechanics) could be sent to a Squadron/unit for a variety of reasons.

And keep in mind that some information might not have reached the records, due to all sorts of reasons.