Any military types here ever heard of a series 3 special military variant nick named Zub Zub?

I was chatting to a school mate today, he’s a Land Rover nut. He’s also ex NZ SAS and was saying on deployment to Zimbabwe in 1979/80 as part of Operation Midford to monitor/observe the handover during independence they had six long wheelbase series 3’s they called Zub Zub’s. He showed me a very grainy black and white photo of the drivers side of one of the vehicles. It was surrounded by soldiers so hard to see a lot but from that profile looked just like a series 3 with a safari roof.

Any idea what the history of these may be?