Does that mean every numbered building on base? Like water pump stations, electrical access facilities, flightline barrier huts and even the toilet facilities at recreation areas?
I think the mission should dictate the need. If they can't justify the mission, they don't need the phone.
33-111 should list common requiremenst for service and special cases are listed in appendix 4, but others should at least claim safety concerns for personnel working at that location (i.e. ability to contact fire/life safety during emergency).