In the New York Times, Bruce Bartlett suggests that the upcoming Defense budget sequester might give Republicans a chance to flex Keynesian muscles they forgot they had:
Indeed, some economists have argued that military spending has in fact been the primary vehicle through which Keynesian economics has operated during the postwar era. The reason is that conservatives who routinely denounce government always give a pass to military spending.
... It is clear in today’s world that national defense does not consist only of bombs and rockets. Adequate public infrastructure, a well-trained labor force that can produce soldiers capable of operating high-tech weaponry, and a strong economy are as important as the traditional tools of war, or more so.