But why are army types called 'pongos'?
The best anti-RAF nickname I heard was from someone on this site who told of some utter ar$e RAF officer who was on an exchange with the Army Air Corps. Where he earned the nickname 'Lobster'; he thought that this was because he was rather a 'superior crab'. Whereas in fact it was merely because, like a lobster he had a thick shell and had his bowels in his head!