FB:-
He was a servicing commando
If the presence within the invading force of the RAF might be a surprise to some, the term "RAF Commandos" might equally be. Formed some two years earlier than D-Day, they kept the aircraft serviced on the front line airstrips; in Europe, the Middle East, and the Far East. I was pleased to see they had a mention in this year's Remembrance Festival:-
https://en.wikipedia.org/wiki/Royal_Air_Force_Commandos