This chapter examines how US officials responded to their ultimately unsuccessful attempts to shape Anglo-American grand strategy during 1942 by changing their approach to these debates in 1943. It argues that War Department civilian and military officials led this effort by overhauling US strategic planning processes and forcefully criticizing British strategy and policy as antithetical to American political objectives. Army planners tactically used their position within the US foreign policy process to craft a hostile narrative about British military aims to shape how their superiors approached US–UK strategy formation and to prioritize their own conceptions of America’s geopolitical ambitions. These efforts hardened US officials’ determination to advance Washington’s wartime goals above London’s and helped forge a strong level of political coordination between the War Department and the JCS for ensuring this occurred. The result was that American defense officials were able to convince President Roosevelt to back their strategic views and to shun Britain’s Mediterranean approach for defeating Germany.