Actually, I can see the SLDF spending money on a Mobile HPG carrier. They have the money to do it and militarily it makes sense. I'm sure the SLDF would have their own HPGs right there on the base. That way, they don't have to "go into town" to access the civilian HPG com site. By having mobile HPG carries, not only would the SLDF have back ups in case the main HPG went down but they'd be used when the troops are out in the field. That way they don't have to risk sending messages back to the base and them being intercepted.