Information Operations is a category of direct and indirect support operations for the United States Military. By definition in Joint Publication 3-13, "IO are described as the integrated employment of electronic warfare (EW), computer network operations (CNO), psychological operations (PSYOP), military deception (MILDEC), and operations security (OPSEC), in concert with specified supporting and related capabilities, to Information Operations (IO) are actions taken to affect adversary information and information systems while defending one's own information and information systems.

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.