Defense (n.) of a Vietnamese town, in the war reporting, meant destroying it to protect it from attackers — when the only attackers were American.
Defense (n.) is the only thing states ever admit to doing; none has confessed to aggression, at most to "preemptive defense."
Defense (n.) is everything every state ever did, on its own diplomatic record; Genghis Khan's papers, if we had them, would surely say so too.
Defense (n.) has long been the cover under which the public pays for high-tech industry, without ever being asked whether it would rather spend on health or schools.
Defense (n.) is the stance every state claims throughout history: it is always resisting a challenge to order and its noble principles.
Defense (n.) stretched far enough licenses any invasion: if making a revolution at home counts as "intervention" abroad, the invader is always only defending himself.
Defense (n.) is best done, for a libertarian revolution, by its political appeal to the workers of the countries attacking it.
Defense (n.) is the conventional name for any hazardous or controversial initiative; a claim made so predictably that it carries no information.