This final chapter summarizes the key points discussed in the previous chapters. It illuminates how diverse adults in the United States helped to build the link between youth, education, and national security from World War I to World War II. The chapter also discusses how this connection both changed and influenced developments in the second half of the twentieth century, when the Cold War changed American ideas about who should serve militarily. Nonetheless, the relationship between youth, education, and national security has remained powerful and continues to influence young Americans today.