"Korea showed that limited wars were possible. Conventional forces, either American or local, were needed if similar cases recurred. Of course, it is better to avoid limited wars than to have to fight them, and in this Korea provided important lessons. By strongly implying that it would not defend Korea (in large part because decision makers did not think an attack there would be an isolated one), the United States had invited attack. It would not make the same error in the future; it would extend commitments to threatened areas, stake its reputation on meeting force with force, and thereby deter adventurism. SEATO, CENTO, and permitting Greece and Turkey to join NATO thus followed."