Supreme Commander of the Allied Expeditionary Force

The Supreme Commander of the Allied Expeditionary Force was the military leader in charge of coordinating and overseeing all Allied troops involved in the Western European campaign during World War II, particularly for the D-Day invasion in June 1944. This person was responsible for planning, strategy, and execution of the massive amphibious assault on Nazi-occupied Europe, ensuring cooperation among diverse Allied nations' forces. In essence, the Supreme Commander was the top military authority guiding the combined Allied effort to defeat Nazi Germany in Western Europe.