Today marks the seventieth anniversary of Exercise Tiger - a military training exercise that went catastrophically wrong on the South Devon coast.
A ceremony will take place today at Slapton Sands. The exercise was supposed to be a trial run for the D Day landings, but more than a thousand Americans were killed after being attacked by German ships
There'll also be a special guest of honour. Edward Sobczyk, who's now in his nineties helped save hundreds of lives during the exercise. He was awarded a medal for his bravery - and then stripped of it because President Eisenhower didn't want people to know about it.
A memorial service has taken place to mark the start of events leading up to the 70th anniversary of a wartime disaster. Hundreds of US servicemen died during a botched practice run for the D-Day landings.
The Military Wives choir are to sing this afternoon at a memorial service marking events leading up to the 70th anniversary of Exercise Tiger. The wartime exercise on the South Devon coast left hundreds of US servicemen dead when their landing ships were attacked by German E-boats.
The service starts at 2.30pm in a marquee at Torcross with a parade of regimental standards. US veterans will take part in a wreath-laying ceremony attended by American diplomats and local people who were affected.
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: