In January 1944 he resumed command of ETOUSA and the following month was officially designated as the Supreme Allied Commander of the Allied Expeditionary Force (SHAEF), serving in a dual role until the end of hostilities in Europe in May 1945.
In January 1944 he resumed command of ETOUSA and the following month was officially designated as the Supreme Commander of the Allied Expeditionary Forces Headquaters (AFHQ), hence turning AFHQ into Supreme Headquaters of Allied Expeditionary Forces (SHEAF). He served in a dual role until the end of hostilities in Europe in May 1945.