https://en.wikipedia.org/wiki/Johnny..._(RAF_officer)
Johnson's autobiography George "Johnny" Johnson, The Last British Dambuster was published in 2014.
McCarthy's crew in Lancaster AJ-T (T-Tommy) were detailed to attack the Sorpe Dam, the structure of which differed considerably from the other main targets insofar as it being an earthen dam as opposed to the gravity construction of the Möhne and Eder dams, thus necessitating a completely different type of attack. Like the rest of No. 617 Squadron, Johnson had practised dropping his bomb as the aircraft flew straight towards the target at low level. However, on the afternoon prior to the raid, when the five crews detailed to attack the Sorpe Dam received their briefing, they were told that they had to fly along the dam wall and drop their mine at its centre. It would roll down the wall and explode when it reached the correct depth. The specialist bomb sight developed for the raid would also be of no use.
https://en.wikipedia.org/wiki/Operation_Chastise
The trench attack of the Death Star in "Star Wars: A New Hope" was inspired by the dambusters missions.
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