Some warriors are drawn to the thrill of combat and find it the defining moment of their lives. Others fall victim to fear, exhaustion, impaired reasoning and despair. This book synthesizes the wartime experiences of American soldiers, from the doughboys of World War I to the grunts of Vietnam. Focusing on both soldiers and marines, it draws on histories and memoirs, oral histories, psychological and sociological studies and even fiction to show that their experiences remain fundamentally the same regardless of the enemy, terrain, training or weaponry.