<i>Royal Air Force Bomber Command, 1942-1945.</i><br>
Operation CHASTISE: the attack on the Moehne, Eder and Sorpe Dams by No. 617 Squadron RAF on the night of 16/17 May 1943.  No. 617 Squadron practice dropping the 'Upkeep' weapon at Reculver bombing range, Kent.  Second launch sequence (5): a group of observers watches as the bomb bounces toward the shoreline.  Dr Barnes Wallis, on the extreme left of the group, can be seen urging the bomb on.
IWM staff photographers
<p><a rel="nofollow" class="external free" href="http://media.iwm.org.uk/iwm/mediaLib//167/media-167690/large.jpg">http://media.iwm.org.uk/iwm/mediaLib//167/media-167690/large.jpg</a>
</p>
<div style="margin:0.5em;"></div>
<div class="center centered" style="width:auto;">
<table style="width:100%; border:1px solid black; background:#E0E0E0; padding:0; text-align:center;"><tbody><tr><td align="left"><img alt="IWMLondonThumbnail.jpg" src="https://upload.wikimedia.org/wikipedia/commons/c/c3/IWMLondonThumbnail.jpg" decoding="async" width="80" height="54" data-file-width="80" data-file-height="54"></td>
<td>This photograph <a rel="nofollow" class="external text" href="https://www.iwm.org.uk/collections/item/object/205022913">IWM FLM 2343</a> comes from the collections of the <a rel="nofollow" class="external text" href="https://www.iwm.org.uk/">Imperial War Museums</a>.
</td>
<td align="right"><img alt="Flag of the United Kingdom (3-5).svg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/Flag_of_the_United_Kingdom_%283-5%29.svg/80px-Flag_of_the_United_Kingdom_%283-5%29.svg.png" decoding="async" width="80" height="48" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/Flag_of_the_United_Kingdom_%283-5%29.svg/120px-Flag_of_the_United_Kingdom_%283-5%29.svg.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/Flag_of_the_United_Kingdom_%283-5%29.svg/160px-Flag_of_the_United_Kingdom_%283-5%29.svg.png 2x" data-file-width="177" data-file-height="106"></td></tr></tbody></table></div>