The rather childish 'container' and 'cranium' nonsense seems to have originated in the F-15 world. They told us that it was to avoid offense to their wimmin....
So one day an official UK request was made for the Spams to stop using a word which was causing great offense to our girls. Anxious to avoid an incident, the dim-witted Spams (who can never sense a spoof coming) asked what the word was...
"Bush!"
Anyway, we said, if you cannot say 'box' or 'head', what do you call a German? A 'container-cranium'?