And where exactly in WW2 did America use mustard gas?
Only thing remotely close I can think of was the aftermath of the air raid on Bari in ww2 where the liberty ship SS John Harvey had mustard gas munitions onboard, and got sunk.
The results were pretty bad.
Made worse by bureaucratic tape and the cargo being “secret” at the time.
We’d shipped over the mustard gas “just in case” the third reich decided to use poison gas
Ultimately we didn’t need it.
But at the time command was worried about it.