The Soviet Union's alarming investment antiship missiles stimulated a tremendous investment in countermeasures. It influenced the purchase of the Grumman F-14 Tomcat, as well as more advanced airborne and surface early warning radars and fire control systems, and new gun and surface-to-air missile systems. But despite such corrective measures, the problems posed by newer generations of weapons continue to confront naval planners in the present day. Indeed, it can be argued that, at best, defensive measures have kept up with the threat, not surpassed it.