World War II "Ghost Army"

A recent story in The Atlantic tells a brief history of the "Ghost Army," a U.S. military unit whose sole purpose was to deceive the Germans.  They accomplished this feat in part by creating all the signs of a military units that did not really exist:  fake tanks and airplanes for German reconnaissance aircraft to see; the same soldiers wearing different uniforms as they moved around England for German spies to observe; and the sounds of a moving army broadcast by speaker through an empty forest in France.  Combined with British intelligence operations, these efforts convinced Adolph Hitler that the Allied invasion would occur at the Pas de Calais, rather than Normandy, and it was so effective that Hitler still believed Normandy was a diversion, even when the landings started.  It reminds me of a line from a song of the same era, "Whose Yehoodi" - "the little man who wasn't there . . . ."