Unlimited Shit and Mass Confusion (“USMC” backronym)

“Unlimited Shit and Mass Confusion” is a backronym (back acronym) of “USMC” (United States Marine Corps). “Unlimited Shit and Mass Confusion” has been cited in print since at least 1991.
 
Other backronyms of “USMC” include “Uncle Sam’s Misguided Children,” “Uncle Sam’s Motorcycle Club,” “Uncle Sam’s Motorcycle Club,” “University of Science, Music and Culture,” “U Suckers Missed Christmas” and “U Signed the Motherfucking Contract.” Popular “Marine” backronyms include “Muscles Are Required, Intelligence Not Essential” and “My Ass Rides In Navy Equipment.”
       
 
Google Books
Operation Buffalo:
USMC Fight for the DMZ
By Keith William Nolan
Novato, CA: Presido
1991
Pg. 145:
The Marines said that USMC meant Uncle Sam’s Misguided Children or Unlimited Shit and Mass Confusion, but Lindenmeyer knew that to U.S. Navy personnel like himself, USMC really stood for U’re Shittin’ Me Chief?!
 
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Jason Owen Stanfield
3/24/97
(...) 
USMC…..Unlimited Shit and Mass Confusion…..heehee
   
Google Groups: alt.folklore.military
Semper Fi.
MM
6/4/98
.(JavaScript must be enabled to view this email address) wrote in article <3574D09D…@home.com>

...
> U.S.M.C.
> is a acronym for Uncle Sam’s Misguided Children.
or Unlimited Shit Mass Confusion or yoU Suck My Cock were the ones I also heard of while in the Marines.
 
Google Books
The Good Bits
By Robert A. Hall
Bloomington, IN: AuthorHouse
2005
Pg. 137:
Marines wear their emblem and “USMC” with pride. Privately, they say USMC stands for other things; “U-Suckers-Mis-Calculated,” or “Uncle Sam’s Misguided Children.” My personal favorite is, “Unlimited Shit and Mass Confusion.”
   
The SoundHole
“NOTHING IS WORTH DYING FOR”
Post by Chilibill on Jul 4, 2009 at 11:19am
It was May 1971 on the mall in Washington D.C…... a moratorium, an anti-war protest, and by many accounts an effort by the “peace movement” to shut down Washington D.C.
(...)
I was about three years and five months into a 4 year enlistment in the USMC (known to most as the U.S. Marine Corps…. A.K.A. Uncle Sam’s Mountain Climbers and sometimes bitterly called Unlimited Shit & Mass Confusion). I had gone on active duty and began basic training on January 10, 1968 (approximately 3 weeks prior to the beginning of the Tet Offensive).
 
Google Books
Excrements:
From an Aged Mind a Collection
By Bickford Parker
Xlibris Corporation (Xlibris.com)
2010
Pg. 98:
Parris Island wasn’t at all like the sergeant had described it to me! First of all, there were no girlies, and the overall mode was unlimited shit and mass confusion. I suppose, that’s what the USMC initials stand for.