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Peace operations have become the most prevalent and prominent form of operation undertaken by the U.S. military in the post-Cold War era. Still, there is little systematic scholarship devoted to mass American public opinion on peace operations. In an attempt to fill this void, this study employs a “structured, focused comparison” to discern patterns in the three most publicized, completed peace operations undertaken by the U.S. since the Gulf War: Operation Restore Hope in Somalia, Operation Support Hope in Rwanda, and Operation Uphold Democracy in Haiti. The main research question is: “Under what conditions does the public support U.S. military participation in post-Cold War peace operations?” Following a systematic and comprehensive analysis of the survey data related to each case, the study finds that there are several factors which can help secure and sustain public support: individual military objectives and overall principal policy objectives affect support, with humanitarian and foreign policy restraint objectives usually receiving higher support than internal political change objectives; news reports affect public support, with ‘good news’ reports—those implying successful outcomes—producing higher levels of public support than ‘bad news’ reports—those implying unsuccessful outcomes; fatalities affect support, with support dropping as the number of casualties—incurred and anticipated—rise; and the existence of a ‘dissensus’ among political leaders affects support, producing lower support when there is an observable division among the political elite. The identification of an operation as multilateral also seems to affect support positively, but only prior to the deployment of troops. Ultimately, however, the public usually does not consider a peace operation to be one of the most important problems facing the country. This provides the president with a greater degree of political latitude in formulating and executing military policy pertaining to peace operations. The study concludes with policy-relevant suggestions for securing and sustaining public support for the use of force in post-Cold War peace operations.