During World War II, the U.S. Army created a "Ghost Army" that used inflatable rubber tanks, sound effects, fake radio transmissions, and performance art to fool the Germans into miscalculating the strength and location of American troops. Its mission remained classified until 1996. Filmmaker and author Rick Beyer ("BY"-er) talks about the 1,100 men who served with the 23rd Headquarters Special Troops – aka the Ghost Army – during the war. Mr. Beyer has directed a documentary and co-written a book about the unit.   
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