Lancaster bomber sits on the runway before take off at RAF Scampton on May 16, 2013 in Lincoln, England. Ladybower and Derwent reservoirs were used by the RAF&#39;s 617 Squadron in 1943 to test Sir Barnes Wallis&#39; bouncing bomb before their mission to destroy dams in Germany&#39;s Ruhr Valley. Today marks the 70th anniversary of the famous Dambuster mission and will be watched by veterans from the original campaign.