What was the occupation of Lance Corporal Jack Jones in the British TV sitcom 'Dad's Army'?

My 22 yr. old son started watching this off of netflix, it's pretty funny. We also watch Are you being served.☺

"Don't tell him Pike"

I've always thought that the comedy formula for Dad's army, Are you being served and also Hi de Hi relied on the fact that people from different walks of life, who wouldn't usually socialise, we're thrown together and had to find ways to cooperate. What do others think?

don't panic, Mr Mainwaring! don't panic, sir

"They don't like it uppum"

TimboATFC2018, “Don’t tell him your name , Pike”