My wife pointed out recently that lots of military equipment designations have the words in an odd order. For example: Projector, Infantry, Anti-Tank (PIAT). Surely Infantry anti-tank projector would be the usual order? Amoured Vehicle, Royal Engineers (AVRE). Why not Royal Engineers Armoured Vehicle? Landing Craft, Infantry (LCI). Why not Infantry Landing Craft? I'd got so used to it that I didn't even notice the oddity until my wife pointed it out. Do any of you know why they're written this way?