From Halopedia, the Halo wiki
Hey again, to my knowledge the Special Warfare Center was never in any doubt. "Armor Testing" calls it out at the end. And I believe a couple sources prior mention a Warfare Center here and there prior. The UNSCOTEC actually judging by Armor testing and the blister are not the same location but near one another. (Or OTEC is just a facility part of the SWC but no source makes that clear sadly)
It was more the stuff that HBO (Happy 20th to them) was spouting without sourcing that was in doubt till yesterday.
And ahh yes the Joyride Series 4 ODST Figure. It has "NSWG2-ODST team 5" on it which I assume is short for "Naval Special Warfare Group 2-Orbital Drop Shock Troopers team 5". Which is a curiosity tbh, unless I am mistaken that may actually be the 105th. But I am left with a lil uncertainty.
Psst you may like this discovery I made. Its quite big I wont lie and actually I presume is the source of stuff folks tried to add a few times over the years. 
TLDR: The 340th ODST Combat Training Unit is canon. And the UNSC Operational Test and Evaluation Center is canon.
Yo you may find "this" interesting. And a pain. https://www.halopedia.org/Special:WikiForum/Jake_Courage_and_canon
Ahh thats cool. Love trivia like that.
The first EVG is also annoying at times for being specific to one model and then saying it appears in other media despite that specific model only being in 1 game. Something you may have noticed here and there in it. (Yes yes I know it was for convenience on the reader cause it was squishing a lot of games into 1 book)
I am kinda under the impression the EVG is primary talking about the Halo Reach one. Kinda what I plan to use to say the Morsam lacks the fuel rod weaponry.