The infamous "toilet seats" were actually what people would usually think of as a whole toilet without the plumbing parts. And they were specialized pieces that had to fit in a very specific place on a combat aircraft and meet lots of exacting specifications.

Saying the military paid $640 for the same kind of toilet seat you might put on your toilet at home is more than a little misleading.

https://en.wikipedia.org/wiki/Toilet_seat#US_Navy.27s_.22.24...