The EU’s German-led investment deal with China aside, the incoming U.S. administration, almost by default, will reinvigorate U.S.-German relations. But post-election optimism should not obfuscate underlying urgencies. In the coming decade, the West will face emerging geopolitical threats that no ally, including the United States and Germany, is better off facing alone. As the United States continues to focus on China, Europe will have to up its contribution. The Biden administration should therefore seize the opportunity of the honeymoon period after January 20 for strategic effect. Enhancing U.S.-German cooperation on military mobility — the seamless and speedy movement of troops, materiel, and assets — would further this aim.