A discussion, addressed to political scientists, of only one of the economic considerations suggested by the title --the supply of funds for national security. The classical economic model provides that any increase in one segment of the economy (defense funds, for instance) requires compensatory decrease in another or an increase in taxes. The Keynesian model provides that in a period of unemployment no such compensation is needed. The Keynesian model is closer to reality, but enough individuals in power support the classical model that this compensatory decrease does occur. The paper poses a series of questions such as "How possible might it be to move toward the...Keynesian model through political education and/or pressure?" Answers require the techniques of the social scientist.