It won't be our troops doing the door knocking.
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US Government <<<
Many sites say same as above link. Take it for what you will , fear or reality.
First it will be to limit and or completely eliminate private arms thru legislation.
Then the UN will be given power on our soil as we sign onto the NWO. A grace period will be given for all who want to turn them in same as Australia and Britain. Then threats will be made publicly thru the media scaring many more into turning them in. Stiff penalties for not following the new laws will be announced. Then after all that they will begin simple house to house searches. Again many with families and beemers will open the door and cower in fear of foreign troops. It won't be us troops or police it will be underpaid expats from all over getting paid your tax dollars (how ironic) to kick your door in. The individual will slowly be weeded out. Many will 'head to the hills' in resistance. There will be a partisan group nationwide fighting the govt and foreign troops.
Seem like a fantasy?
Study a history book as countless populations have been enslaved in same fashion for centuries.