I don’t think any of those three agencies has what it would take to pull it off, and I think they and their masters know it, and are hoping we would accept a bluff. I don’t think we will.
Gun confiscation would require a SWAT team to go door to door like a nationwide Fallugah in every little town and major city in the land, either simultaneously or in blitz fashion. Many cops/troops wouldn’t accept the mission against fellow citizens in the first place, and for the ones who would they will find saboteurs and deserters common among their ranks. Even if all goes smoothly, the attrition rate would likely decimate &/or demoralize them by the end of the first block.
Even if reduced to smoke signals, folks are going to know when the cops/troops/UN-Rapists are on their way. Heavy arms are not going to add much to the equation either, unless they simply use weapons of mass destruction - not that Obama and his ilk wouldn’t.
Guerilla tactics and various forms of resistance will do to our troops what they did in every little hellhole we tried unsuccessfully to fight in since WWII, but on a much, much larger scale. Add to this the upwelling of anti-government sentiment when the troops come through Gestapo/Storm-trooper style or with tanks, or “soften up” the battlefield with pre-strike artillery barrages, and I think you get the picture.
The logistics behind such troop movements, especially bringing our own or foreign troops from overseas en mass, would be also be daunting.
Not going to happen, unless we are fooled by the bluff.
I guessing it won't look like that.
First, they pass a law making, let's say, AR15s illegal to own.
Then they can use this law to pick up any offender, at their own pace, selectively.
No need to make a dangerous sweep. Just enforce the law as they wish, like they do now.