There is no organization. Very few would resist. Unorganized, untrained, 21st Century soft individuals will not have the nerve to rush to get themselves shot to pieces killed. Think Predator Drone, think Wart Hog. This talk about armed resistance sounds like fantasy-land bravado. Fifty years ago, maybe. Now, no way. The last of the ‘Nam draftees (US) and the ‘Nam volunteers (RA) are too old, and the all-volunteer troops after ‘Nam have been worn out and used up by multiple deployments. Think it through.
But...
Unorganized, Trained, 20st Century HARD individuals WILL have the nerve to postion themselves so that OTHERS get shot to pieces and killed.