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By Paul R. Pillar
SINCE WORLD WAR II—the largest military effort ever by the United States, and one ending with clear victory—the use of U.S. military force overseas has exhibited two patterns. One is the increasing frequency and duration of the application of force. This trend has become especially noticeable since the turn of the twenty-first century, with the United States fighting its two longest major military campaigns, in Afghanistan and Iraq. Simultaneously, Washington has conducted combat operations in Libya, Syria and elsewhere, all under the indeterminate rubric of “war on terror.” An entire generation of Americans has come of age with its country perpetually at war.