This reminds me of a Security Breach I was once hit for. Many years ago I bought a Truck, Utility, Half Ton, Air Portable; Rover. It put the fun (and recently, the poverty) back into motoring. Like all good military machines, it was complete with a technical manual and that was often in my desk drawer for me to read during dins breaks. One night I forgot to lock my desk drawer and the ever vigilant MoD Guard noticed the rear section on electrical equipment was RESTRICTED!