The image of the drug-addicted American soldier--disheveled, glassy-eyed, his uniform adorned with slogans of antiwar dissent--has long been associated with the Vietnam War. More specifically, it has persisted as an explanation for the U.S. defeat, the symbol of a demoralized army incapable of carrying out its military mission. Yet as Jeremy Kuzmarov documents in this deeply researched book, popular assumptions about drug use in Vietnam are...