I was once an RAF SAC and was accused of un Airman like behaviour by coming to work in a rather fancy two-seater Italian sports car
What was unusual about that? In the sixties the Sergeants' Mess had a row of Jaguars and MGs whilst the Officers' Mess had beaten up old Fords and Vauxhalls.
I would have earned far more as a sergeant pilot and on oversea detachments my LOA was less than a SAC's.