“The soldier who survived mustard gas and pepper spray is now a seasoned veteran” is a jocular one-line saying that is frequently grouped with similar puns. “The man who survived mustard gas and pepper spray is now a seasoned veteran” was posted on the newsgroup alt.support.schizophrenia on August 25, 2008.
 
Other “seasoned” jokes include “Seasoned fries are what rookie fries eventually become” and “What do you call a spice with some experience?”/“Seasoned salt.”
   
   
Google Groups: alt.support.schizophrenia
Sprain your brain with this:
Deep Thoughts
8/25/08
(...)
20. The man who survived mustard gas and pepper spray is now a seasoned veteran.
 
5 October 2008, Edmonton (Alberta) Journal, “Real estate plumbs new depths in Saginaw” by Terry McConnell, pg. G2:
The man who survived mustard gas and pepper spray is now a seasoned veteran.
 
Twitter
John Dedeke‏
@johndedeke
Replying to @marseeah
@marseeah The soldier who survived mustard gas and pepper spray is now a seasoned veteran.
9:20 AM - 13 Nov 2008
     
Google Books
Inside a Dog
By Dave Guthmann
Lulu Press (Lulu.com)
2009
Pg. 15:
“Those soldiers attacked with mustard gas and/or pepper spray are now seasoned veterans.”
 
Twitter
Bad Joke Cat‏
@BadJokeCat
A soldier who survived mustard gas and pepper spray is now a seasoned veteran.
5:04 PM - 10 Mar 2014
   
Reddit—Jokes
There was a soldier who survived mustard gas and pepper spray
submitted June 24, 2015 by KaboomOxyCln
He’s now a seasoned veteran.
   
Google Books
3000 Jokes, 2997 Laughs
By Mike Haskins
London, UK: Portico
2017
Pg. ?:
Josh was in the military and survived assault by mustard gas and pepper spray. He is now known as a seasoned veteran.
 
Reddit—Oneliners
The soldier who survived mustard gas and pepper spray is now a seasoned veteran.
submitted October 27, 2017 by sunilkumar273