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This may look like a bizarre game of Guess Who, but these unusual pictures of Adolf Hitler were used by Allied forces during World War II to pre-empt any attempt to escape.

US intelligence officers feared the Fuhrer might alter his trademark slick hair and moustache in order to flee Germany.

To prepare for this eventuality, the Office of Strategic Services, an early version of the CIA, commissioned artist Eddie Senz to create portraits of Hitler in different disguises.

(Image: Reuters)

The images, released by the US National Archives in Washington, show the Nazi leader completely bald and cleanly shaven.

The dictator is also shown with thicker, unstyled hair and a bushy beard with a longer moustache.

(Image: Reuters)

Senz, a New York makeup artist, also thought Hitler may try to outsmart his enemies by donning a pair of round spectacles and shaving his moustache pencil thin.

The portraits were produced on June 6, 1944, the day after D-Day.

The images were circulated to Allied Commanders during World War II but were unearthed again in the 1990s by German magazine, Der Spiegel.

(Image: Reuters)

Despite fears Hitler would attempt to flee Germany, the portraits were never needed.

On April 30, 1945, as his Third Reich was losing power, the Fuhrer committed suicide in his bunker, alongside wife Eva Braun.