My father qualified as an air gunner during his RAF service between 1924 & 1936. He was an admin clerk.
He was still on the active reserve in 1939 and called up with the BEF to France in 1939/40. He was a clerk again, but his log book shows he flew on Battles as an occasional air gunner/wop. He was commissioned later & flew on Liberators 'unofficially', as his position on the Sqn as adjutant/intel officer meant he was 'officially' banned from operational sorties. Photos at the time show he sometimes wore an AG brevet, sometimes not. In 1946 he was again a Sqn adjutant, and sometimes flew as W/Op on trooping flights to Palestine and India.
I still recall him and an old friend talking to each other in morse code whilst having a beer at the local ...