# Ghost Army The 23rd Headquarters Special Troops — a U.S. Army tactical deception unit during World War II that used inflatable tanks, sound effects, and radio deception to mislead enemy forces. The Ghost Army's electronic deception capabilities drew on [[wiki/Bell Labs|Bell Labs]] audio and radio technology, representing one of the defense applications of Bell System engineering. Referenced in [[articles/Bell Labs and the Distributed Architecture of American Power|Bell Labs and the Distributed Architecture of American Power]].