“Aren’t Ready for the Marines Yet” (sometimes also “Aren’t Ready to be Marines Yet” and “Aren’t Really Marines Yet”) is a backronym (back acronym) for the word “army.” “Aren’t Ready to be Marines Yet” was cited in print in March 1995 and “Ain’t Ready for the Marines Yet” was cited in print in May 1995. “Aren’t Really Marines Yet” was cited in June 2002.
 
Other backronyms for “army” include “Ain’t Really Men Yet” and “Airforce Rejected Me Yesterday.” “Uncle Sam Ain’t Released Me Yet” is a backronym for “U. S. Army.”
     
 
Google Groups: rec.arts.comics.misc
Marty Busse
3/20/95
The X-Files preacher was an ex-MARINE, not an ex-army man.  Big difference.  As any jarhead will tell you, Army stands for “Aren’t Ready to be Marines Yet.” 
 
Google Groups: sci.military.naval
Derek Neil Condra  
5/12/95
Marine Soliders. How about Marine Jokes?
(...)
So, the entire time he’s poking fun at people, trying to scare any seventeen or eighteen year olds who really didn’t want to be there. When its my turn, I proudly say, “I’m goin’ in the Marines!”  to which he replies, “Marines?  You know what Marines stands for: Muscles Are Required Intelligence Not ESsential.”
 
This gets a huge laugh from all the other branches’ recruits.  Then the petty officer says, “Hell, I don’t know what you army guys are laughing at, ARMY stands for Ain’t Ready for the Marines Yet.”
 
Slashdot
alternative
by Anonymous Freak on Thursday February 25, 1999 @07:53PM (#2017133) Journal  
(...)
NAVY = Never Again Volunteer Yourself
ARMY = Aren’t Ready to be Marines Yet
MARINE = Muscles Are Required, Intelligence Not Expected (or) My Ass Rides In Navy Equipment
USAF = Under Sexed Ass F*ckers. (If any one knows one for full “Air Force”, I’d like it… It was my service.)
   
Snopes.com Message Board
D. Dodge Silver
posted 10 June, 2002 12:27 AM  
On the subject of derogatory service names:
 
NAVY: Never Again Volunteer Yourself
MARINES: My A$$ Rides in Navy Equipment, Sir
ARMY: Aren’t Really Marines Yet
AIR FORCE: Ain’t It Really NFBSKing Obvious, Retards Command Everything?
 
Google Books
Iraq: Eyewitness to War:
A Photojournalist’s Diary
By Robert Galbraith
Montreal: Robert J. Galbraith
2004
Pg. 67:
“The Army isn’t as disciplined and professional as the Marine Corps,” says Nino. He also states that, “To a Marine, Army stands for ‘Ain’t Really Marines Yet!’”
     
Syfy Forums
GunslingerG
Posted 05 November 2006 - 09:10 PM
(...)
ARMY= Aren’t Ready to be Marines Yet
 
1 December 2006, Aberdeen (SD) American News, “War hero shares message at NSU,” Sports, pg. 1D:
Or to get a laugh such as Army (Aren’t really Marines yet).
 
Marine Corps Forum
roderickyseaton
03-06-07, 05:29 AM
(...)
M.A.R.I.N.E.S. (Marines Aren’t Ready In Navy Elite Seals (yet)) As opposed to the Army (Aren’t Ready to be Marines Yet).
   
Google Books
Captive Spirit:
A Novel of the Dark Crescent Sisterhood
By Anna Windsor
New York, NY: Ballantine Books
2010
Pg. 163:
“Army.” She took his uncasted hand in hers. “Aren’t Ready for Marines Yet, right?”
 
Twitter
mtei_uni
‏@mtei_uni  
ARMYって何かの略か聞いたらマリンコから
Aren’t Ready for the Marines Yet　とかえってきた。ちなみに
MARINESはMuscles Are Required Intelligence Not Essential Stupidだそうだ
2:01 AM - 16 Jul 10
 
Facebook
Aren’t Ready for the Marines Yet (ARMY)
(Joined Facebook on July 19, 2010.—ed.)
 
Urban Dictionary
army
Arent really Marines yet
(...)
by Jack Ashton Nov 25, 2010
     
Twitter
U.S. Marines ‏
@usmcquotes  
ARMY – Aren’t Ready for Marines Yet/Aren’t Really Men Yet, pejorative backronym used by other branches.
8:35 AM - 16 Apr 13