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

<specific_vehicle_type-pl>

combat engineering vehicles

<specific_vehicle_type-sing>

combat engineering vehicle

<specific_vehicle_type-not_creatable-pl>

combat engineering vehicles

<specific_vehicle_type-creatable-sing>

combat engineering vehicle

<specific_vehicle_type-not_creatable-sing>

combat engineering vehicle

<specific_vehicle_type-not_creatable>

combat engineering vehicle

combat engineering vehicles