I’m Ex RAF, joined up in a technical trade (electronics). Spent most of my time in working in Satellite Communications and came out into the same line of work. I had a great time and would do it all again in a heartbeat. If my kids expressed an interest I’d happily encourage them to consider joining up. The best thing your lad can do is go down to the CIO and have a chat with all three services.
At the risk of a slagging from the Army bods on here- I used to be an instructor in satcomms to the services and most of the Army Signals troops said they wish they’d joined the RAF….