There was a sunset ceremony at RAF Scampton tonight to mark the 70th anniversary of the Dambusters raids.
The Lancaster bombers - armed with the now famous bouncing bombs - flew to the Ruhr Valley from their base just outside Gainsborough, on 16th May 1943.
617 Squadron, led by Wing Commander guy Gibson used those bouncing bombs to attack the industrial heart of Germany.
In total, 133 men took part in the raid, 53 died.
Earlier today two of the surviving Dambuster airmen attended a ceremony and flypast at Derwent Reservoir in Derbyshire.
After the private ceremony at RAF Scampton a public memorial service will be held at Lincoln Cathedral tomorrow (Friday).
Dignitaries and VIPs from Canada, New Zealand, the United States of America, Australia and the Netherlands will be in attendance and flags from their nations, including the Union Flag and the RAF flag, will line the streets in recognition.
Live wartime music and aviation related stalls, including official Red Arrows, Cranwell Aviation Heritage Centre, RAF Cranwell and more, will create an atmosphere in Castle Square, complete with an RAF fly-over at the culmination of the memorial service at 4.15pm.