What, no 'head'?

Going down the rabbit hole, I came to this article.

Why is it called a restroom, anyway? - The Straight Dope

SDStaff Dex wrote:

[N]ow seems like a fine opportunity to work our way through the long list of toilet euphemisms and their origins, so far as is known.

What, no love for ‘head’? Growing up in a Navy family in a Navy town, this term was in common usage when I was very much shorter than I am today.

I don’t know… I used to work with a retired Marine, and among our little group of co-workers, it was definitely “The Head” among us, just because J constantly called it that and we picked it up.