On December 14, 1944, Congress created the temporary grade of “General of the Army” and authorized the president to nominate no more than four individuals for the positions. The point was to give the American commanders a rank equivalent to the British Field Marshal.
George Marshall, Douglas MacArthur, Dwight Eisenhower, and Henry Arnold were FDR’s chosen ones, all nominated one day after Pub.L. 78-482 was passed:
I assume all four sported this enchanting insignia:
Rice on History 
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