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

<specific_vehicle_type-pl>

hellfire missile resupply vehicles

<specific_vehicle_type-sing>

hellfire missile resupply vehicle

<specific_vehicle_type-not_creatable-pl>

hellfire missile resupply vehicles

<specific_vehicle_type-creatable-sing>

hellfire missile resupply vehicle

<specific_vehicle_type-not_creatable-sing>

hellfire missile resupply vehicle

<specific_vehicle_type-not_creatable>

hellfire missile resupply vehicle

hellfire missile resupply vehicles