“My father’s reaction surprised me. Vietnam had made him vehemently antiwar, so I expected him to applaud my decision, but instead he told me that American soldiers had saved the world from fascism during World War II and that thousands of young Americans were buried in his homeland of France. “You don’t owe your country nothing,” I remember him telling me. “You owe it something, and depending on what happens, you might owe it your life.”