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The Ghost Army was a United States Army tactical deception unit during World War II officially known as the 23rd Headquarters Special Troops. The 1,100-man unit was given a unique mission: to deceive Hitler's forces and mislead them as to the size and location of Allied forces, while giving the actual units elsewhere time to maneuver. Activated on January 20, 1944, the Ghost Army arrived in Europe in May shortly before D-Day and returned to the US at the end of the war in July 1945. During their tenure, the Ghost Army carried out more than 20 deception campaigns, putting on a "traveling road show" using inflatable tanks, sound trucks, fake radio transmissions, scripts and pretense.

Their story was kept a secret for more than 50 years after the war, until it was declassified in 1996. In February 2022, members of the Ghost Army were awarded the Congressional Gold Medal, citing their unique and highly distinguished service.