Military defeats leave a lasting imprint on the psychology of nations. Consider Japan and Germany. Defeated in World War II in 1945, both abandoned their pre-war ambitions of military dominance and rebuilt their security arrangements under an America-led order. Japan renounced war as an instrument of state policy and came to depend on the United States’s security guarantee, while West Germany reconstituted its armed forces within the North Atlantic Treaty Organisation, under an alliance structure dominated by Washington. The United States, itself, never quite recovered from the Vietnam War, which ended in 1975. The experience fundamentally altered American military thinking, making its strategists more cautious about prolonged military engagements, the deployment of ground forces and wars without clearly defined political objectives.