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LINCOLN, ENGLAND - MAY 16: Dambuster veteran George "Johnny" Johnson takes part in a Sunset Ceremony to mark the 70th anniversary of the World War II Dambusters mission at RAF Sccampton on May 16, 2013 in Lincoln, England. Ladybower and Derwent reservoirs were used by the RAF's 617 Squadron in 1943 to test Sir Barnes Wallis' bouncing bomb before their mission to destroy dams in Germany's Ruhr Valley. Today marks the 70th anniversary of the famous Dambuster mission and will be watched by veterans from the original campaign. (Photo by Christopher Furlong/Getty Images)

LINCOLN, ENGLAND - MAY 16:  Dambuster veteran  George "Johnny" Johnson takes part in a Sunset Ceremony to mark the 70th anniversary of the World War II Dambusters mission at RAF Sccampton on May 16, 2013 in Lincoln, England. Ladybower and Derwent reservoirs were used by the RAF's 617 Squadron in 1943 to test Sir Barnes Wallis' bouncing bomb before their mission to destroy dams in Germany's Ruhr Valley. Today marks the 70th anniversary of the famous Dambuster mission and will be watched by veterans from the original campaign.  (Photo by Christopher Furlong/Getty Images)