Since 2010, the United States and Brazil have made efforts to expand security cooperation between the two countries with the signing of a defense cooperation agreement, a general security of military information agreement, and the establishment of a defense cooperation dialogue. Despite these positive steps, the issue of technology transfer threatens to impede greater U.S.-Brazil security cooperation. Brazilian defense policy identifies technology transfer as a key component of its national defense, and there is a perception among many Brazilian officials that the United States is reticent to transfer defense technology to Brazil. This book includes an in-depth review of each country's policies and strategies related to arms and defense technology transfers, as well as case studies on cooperation (or lack thereof) between the U.S. and Brazil in two areas-nuclear and aviation-to understand what drives this belief among Brazilian policymakers. The book concludes that historical events in its relations with Washington make it difficult for Brasilia to accept more recent U.S. efforts to enhance security cooperation and facilitate technology transfer on their face, while these same efforts cause U.S. policymakers to discount the importance of past indifference towards or overt efforts to block Brazil in obtaining certain technologies."