When the U.S. Army needed to distract German troops during World War II, it turned to the Ghost Army. And the Ghost Army, in part, turned to plastics and rubber to fabricate inflatable tanks and trucks that could fool enemy troops into thinking an attack was on its way when it wasn't.
On March 21, the Ghost Army received one of the top military awards in the U.S., the Congressional Gold Medal, for its role in the war in Europe. The work done by about 1,100 soldiers not only saved lives — estimates range from 15,000 to 30,000 — it was so secretive information on the unit was classified until 1996.
Officially called the 23rd Headquarters Special Troops, the army was "the first mobile, multimedia, tactical deception unit in U.S. Army history," the National World War II Museum notes.
It was able to simulate two whole divisions — about 30,000 men — using items such as fake patches, sound design and faux artillery.
The Ghost Army was used to make it look like the D-Day landings would be in Calais, France, rather than Normandy.
Its biggest mission, in March 1945, drew German units away from the site where the actual 9th Army was crossing the Rhine River, the Associated Press writes.
Many of the Ghost Army veterans went on to work in the arts and industrial design. Helmut Georg Tietje built a career with plastics, working for medical suppliers Becton-Dickinson & Co. and Health Advancement Inc. He was a member of the Society of Plastics Engineers and held five patents. Tietje died in 1988.