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

<i_f_v-sing>

opfor medium mortar

<i_f_v-pl>

opfor medium mortars

<specific_vehicle_type-pl>

medium tank recovery vehicles

<specific_vehicle_type-sing>

medium tank recovery vehicle

<i_f_v>

opfor medium mortar

opfor medium mortars

<specific_vehicle_type-not_creatable-pl>

medium tank recovery vehicles

<specific_vehicle_type-creatable-sing>

medium tank recovery vehicle

<specific_vehicle_type-not_creatable-sing>

medium tank recovery vehicle

<specific_vehicle_type-not_creatable>

medium tank recovery vehicle

medium tank recovery vehicles