The rules that use the vocabulary item "m978" are:

<specific_vehicle_type-pl>

m978 refuelers

<specific_vehicle_type-sing>

m978

m978 refueler

<specific_vehicle_type-not_creatable-pl>

m978 refuelers

<specific_vehicle_type-creatable-sing>

m978

m978 refueler

<specific_vehicle_type-not_creatable-sing>

m978

m978 refueler

<specific_vehicle_type-not_creatable>

m978

m978 refueler

m978 refuelers