It is my opinion that this may violate Posse Comitatus, but again, that may depend on how it turns out; a training exercise would be legal, something else might not be. There has been a lot of discussion about this and people have voiced legitimate concerns, because it is not always what we are told it is, and again, mistakes do happen.
Your "opinion" as to what does or does not constitute posse comitatus means squat. The act states, quite clearly and very literally what its meant to cover:
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Whoever, except in cases and under circumstances expressly authorized by the Constitution or Act of Congress, willfully uses any part of the Army or the Air Force as a posse comitatus or otherwise to execute the laws shall be fined under this title or imprisoned not more than two years, or both.
Military exercises are a normal part of military life.. they happen every day across the globe with every military force on the planet.
Furthermore, as Soul already pointed out.. IF the military were preparing for a coups, or a hostile take over of ANY kind, they sure as shit wouldnt announce it to the flipping world.. nor would they limit their scope to a few square miles.. Coups dont happen in a few select areas... a land mass the size of the continental US would need a massive instantaneous strike across every state in the union in order to pull off a major coups and put down any potential rebellion.. marking a few states and then ANNOUNCING your intentions isnt exactly being very subtle.. or smart.
Conspiracy Theorists cant have it both ways.. you cant have a military thats so smart and sophisticated that it can do anything, while being completely incompetent at the same time. Which is it? Are they smart enough to pull this nonsense off or not?
People freak out over the craziest stuff. I spent a decade in the military as a US Marine.. this is normal, every day BORING stuff. Its gonna be a bunch of guys standing post talking about football while the college educated idiots sit around and move stuff from one grid square to another in air conditioned tents while they talk about football. There will be some ground training.. classes.. probably some live fire exersizes on ranges (havent seen the syllabus for the drills yet).. This exersize being conducted by the army that everyone's freaking out about, is TINY compared to some of the HUGE exersizes I took part in 20 years ago.
I mentioned it once already.. operation Red Flag.. the ENTIRE country is divvied up into Red Forces and Blue Forces.. aircraft conduct dog fights, simulated bombing runs (some with life munitions), capture the flag ops... it was HUGE and it took place EVERY YEAR for several months at a time.. the people living in those areas were ALREADY used to it, and looked FORWARD to it because a bunch of GIs were going to be stuck on base near these little towns and had NOTHING to spend their money on. Local economy took a HUGE influx of cash as a result.
So relax.. the whole point BEHIND a psyop is that you're not even going to know that you're IN a Psyop.. which means its not going to be announced, its not going to be published anywhere, its going to be completely black.. as in NOBODY is going to know about it... and those in charge arent going to walk up to local government and say "Hey, we're gonna conduct a black op here.. here's the layout of EVERYTHING WE'RE GOING TO DO TO SECRETLY make you get used to stuff while not doing it in secret."