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The surviving Dambusters, with Gibson (centre) and Chalmers (right) at Buckingham Palace after the raid.
The gallantry medals of one of the hero's of the Dambusters' raid have been unearthed 75 years after the famous mission and are tipped to sell for £150,000.
Flying Officer George 'Jock' Chalmers was a wireless operator in the last Lancaster bomber to make it back to Britain following the famous 1943 raid.
Of the 133 crew who took part in the incredibly risky mission to destroy several dams in Germany's industrial Ruhr valley by using Barnes Wallis' 'bouncing bombs', 53 were killed.
His medal group that includes the DFM and DFC as well as his RAF logbook that covers the mission are being sold by dealers War & Son of Herefordshire.