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

<specific_vehicle_type-pl>

forward area air defense ground based sensors

<specific_vehicle_type-creatable-sing>

forward area air defense ground based sensor

<specific_vehicle_type-not_creatable-sing>

forward area air defense ground based sensor

<grammar>

air

air force

<specific_vehicle_type-sing>

forward area air defense ground based sensor

<specific_vehicle_type-not_creatable-pl>

forward area air defense ground based sensors

<specific_vehicle_type-not_creatable>

forward area air defense ground based sensor

forward area air defense ground based sensors