Keep in mind the National Guard was involved in the Katrina confiscations too. As far as I can tell, they didn't actively confiscate guns, but they provided security and support for the police while they were doing it. So as far as I'm concerned, the NG might as well have taken the guns themselves.
Don't kid yourself. The military will follow orders no matter what. Our history is replete with such examples. Ever heard of the
Bonus Army? Our own military was used here on American soil to fire on crowds of people who were protesting. And these weren't even civilians. They were war veterans who were fired upon by their own comrades-in-arms!
Ever heard of
the Kent State Massacre? The National Guard fired on student protesters.
If you think for one minute that the military is going to disobey orders en masse, think again. They will follow orders. They will probably even enjoy it. Your Constitutional rights don't mean jack s**t to them. I'm sure there are a few who will not like what they're doing. But they're not going to risk a court martial or prison time just to defend your rights. They will assume their orders are legitimate. And it will probably happen under circumstances that they think justifies it. They will obey. History proves it. I have never seen any example of military units disobeying orders as a group. You will, at best, see a few people disobey. The vast majority will do what they're told.