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

<specific_platoon_type-creatable-sing>

mixed air defense

<i_f_v-sing>

mixed air defense fcr

mixed air defense fire control radar

swa mixed air defense fcr

swa mixed air defense fire control radar

<i_f_v-pl>

mixed air defense fcrs

mixed air defense fire control radars

swa mixed air defense fcrs

swa mixed air defense fire control radars

<defensive_position_phrase>

hasty defense

<defensive_position_phrase-not_det-sing>

hasty defense

<specific_vehicle_type-pl>

forward area air defense ground based sensors

<specific_vehicle_type-sing>

forward area air defense ground based sensor

<i_f_v>

mixed air defense fcr

mixed air defense fcrs

mixed air defense fire control radar

mixed air defense fire control radars

swa mixed air defense fcr

swa mixed air defense fcrs

swa mixed air defense fire control radar

swa mixed air defense fire control radars

<specific_vehicle_type-not_creatable-pl>

forward area air defense ground based sensors

<specific_vehicle_type-creatable-sing>

forward area air defense ground based sensor

<specific_platoon_type-not_creatable-sing>

mixed air defense

<specific_vehicle_type-not_creatable-sing>

forward area air defense ground based sensor

<specific_platoon_type-sing>

mixed air defense

<specific_vehicle_type-not_creatable>

forward area air defense ground based sensor

forward area air defense ground based sensors