Confusing codenames
Ignoring the codename *beep* (which was the signal for a breach of the Mohne Dam), I am confused by two other code-words:
Everyone seems to have the idea that the whole mission was "Operation Chastise", but if you read the book "The Dam Busters" by Paul Brickhill, on which the film was based, the book says that the original name for the project was "Downwood". This is quoted in Mr. Brickhill's fine book in a conversation between Dr. Barnes Wallis and Cdr. Guy Gibson, during early planning conversations.
Any suggestions ?