Exposure to Sarin gas when incinerating arms caches, apparently.

This is the biggest ing "duh" ever. grrrr

Also:

Don't forget that they gave those of us that went pills as well to take.

pyridostigmine bromide

https://www.publichealth.va.gov/expo...ne-bromide.asp
https://www.militarytimes.com/vetera...f-war-illness/