It’s not an acronym, but I always found this official abbreviation to be a mouthful:
I.B. of T.C.W. & H. of A.
Here’s a hint, Jimmy Hoffa was a member.
Give up?
The International Brotherhood of Teamsters, Chauffers, Warehousemen, and Helpers of America.
There’s an episode of Doctor Who where a bunch of nobodies assemble the London Investigation ‘N’ Detective Agency. There was no reason to strain; it could have just as easily been the London INvestigation and Detective Agency. Of course, the main guy was not particularly bright.
Heee, a coworker and I formed PAPA.
People Against Purposeless Acronyms.
As I’ve noted before, this is the PERFECT name for the organization of Bad Guys in Cars 2.
I’ve always wanted to found Parents United for Kids Education.
From Red Dwarf: “I propose we call ourselves the Committee for the Liberation and Integration of Terrifying Organisms and their Rehabilitation Into Society. One drawback, the abbreviation is CLITORIS.”
And from Cloudy With A Chance Of Meatballs, there’s the Flint Lockwood Diatonic Super Mutating Dynamic Food Replicator, or FLDSMDFR.
You win the thread. 
I like this one, that Arnold claims was unintentional. Riiiiight.
There’s a whole mess of recursive acronyms. It was cute at first, now a bit contrived.
Funny, if they just added in the little words it’d be MOTTO, which isn’t a bad name at all.
Extra dubious given the first name of Mr. Torvalds, who wrote the initial kernel.