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

<i_f_v-sing>

opfor artillery battalion fdc

opfor artillery battery fdc

<specific_vehicle_type-pl>

fdc command post carriers

fdc m577s

<specific_vehicle_type-sing>

fdc command post carrier

fdc m577

m577a1 fdc

<i_f_v>

opfor artillery battalion fdc

opfor artillery battery fdc

<specific_vehicle_type-not_creatable-pl>

fdc command post carriers

fdc m577s

<specific_vehicle_type-creatable-sing>

fdc command post carrier

fdc m577

m577a1 fdc

<specific_vehicle_type-not_creatable-sing>

fdc command post carrier

fdc m577

m577a1 fdc

<specific_vehicle_type-not_creatable>

fdc command post carrier

fdc command post carriers

fdc m577

fdc m577s

m577a1 fdc