Sonic Deception are Sveinbjörn Bjarki Bjarki Jónsson and President Bongo.
The Ghost Army was a United States Army tactical deception unit during World War II officially known as the 23rd Headquarters Special Troops. The 1100-man unit was given a unique mission within the Allied Army: to impersonate other Allied Army units to deceive the enemy. From a few months after D-Day, when they landed in France, until the end of the war, they put on a ‘traveling road show’ utilizing inflatable tanks, sound trucks, fake radio transmissions, scripts and pretence. They staged more than 20 battlefield deceptions, often operating very close to the front lines.
Their story was kept secret for more than 40 years after the war, until it was declassified in 1996.