Does Yossarian have a motto/catchphrase/signature piece of attire?

Cafe Society
1

I seem to remember Yossarian (from Heller’s Catch-22) always wearing some sort of pin or button. Is this right, and if so, what might it have said?

This is, of course, a last minute costume scramble.

Thanks!

2

Well, he was naked at Snowden’s funeral, and when he was being presented with a medal.