The men and women who cracked German codes at Bletchley Park in Milton Keynes during World War II are being officially honoured for their work.
The surviving codebreakers are being given commemorative badges in a service attended by The Duke of Kent.
Thousands of military personnel and civilians intercepted and deciphered encoded messages sent by the Germans.
Foreign Secretary David Miliband said "a debt of gratitude" was owed to the people who worked at Bletchley Park.
He added: "I am proud to acknowledge their ingenuity, skill and determination which helped our country in its time of greatest need."
Simon Greenish, director of the Bletchley Park Trust, said: "These people made an enormous contribution to the outcome of World War II, the 20th century and freedom in the west.
"After many years of having to keep their critical wartime work top secret, it is tremendous that this contribution has finally achieved recognition."
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