Smedley Butler's life and career epitomize the contradictory nature of American military policy through the first part of this century. Butler won renown as a Marine battlefield hero, campaigning in most of America's foreign military expeditions from 1898 to the late 1920s. He became the leading national advocate for paramilitary police reform. Upon his retirement, however, he renounced war and imperialism and devoted his energy and prestige to various dissident and leftist political causes.