The rules that use the vocabulary item "defense" are:
mixed air defense
mixed air defense fcr
mixed air defense fire control radar
swa mixed air defense fcr
swa mixed air defense fire control radar
mixed air defense fcrs
mixed air defense fire control radars
swa mixed air defense fcrs
swa mixed air defense fire control radars
hasty defense
hasty defense
forward area air defense ground based sensors
forward area air defense ground based sensor
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
forward area air defense ground based sensors
forward area air defense ground based sensor
mixed air defense
forward area air defense ground based sensor
mixed air defense
forward area air defense ground based sensor
forward area air defense ground based sensors