According to Paul Brickhill's account, the squadron was formed in such a hurry that one of the things they didn't have was a squadron number. The name "X" was nothing to do with security but was a short-term solution until someone within the bowels of the RAF "got off his bottom and gave them a squadron number" (Brickhill again). The number was allocated well before the Dams raid, but that was only when the squadron was twelve weeks or so old!!!
In "Enemy Coast Ahead" (Gibson's splendid book) Barnes Wallis is referred to as "Jeff", with the admission that that was a cover name. Also Mutt Summers is not named at all, yet both men are fully named in Brickhill's book. This is purely an accident of time, as Guy Gibson's book came out in very quick time after the end of the war whereas Paul Brickhill's was (I think) published in 1954, when a lot more detail could be revealed.
The code name for the operation is now largely accepted as "Chastise", but the strange thing is that "Chastise" never appears in Paul Brickhill's work. He quotes Barnes Wallis as saying that the codename was "Downwood". I suppose it's one of those things that will never be satisfactorily proven, one way or the other.
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