A weekend of commemoration is underway in Devon to mark the 70th anniversary of perhaps the biggest wartime disaster on British soil.
Exercise Tiger was planned as a dry run for the D-Day landings. But it left hundreds of US servicemen dead. The whole story was covered up for decades.
Bob Cruwys reports:
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Friends remember "amazing" Adam Pritchard, who died after apparently plunging down down a sharp drop while cycling with his sister.