I think that the OP should at least familiarize himself with some of the anti-militia propaganda been put out by several prominent liberal organizations that have not only helped to shape public perceptions of such groups, but more importantly have shaped the training provided to law enforcement about right wing extremism and domestic terrorism threats, which treats involvement with a militia as a huge red flag. Otherwise, he might quickly discover that he's subjecting himself to subtle and not so subtle discrimination due to his involvement or at least greatly increased government surveillance of his activities.
The main culprits are the Southern Poverty Law Center with its over $200 million war chest and to a lesser extent the Anti-Defamation League. Freedom of Information Act requests about the sources used in controversial government documents have confirmed the extent of their influence, and a few reputable authors have pieced together their manipulation of public opinion and law enforcement agencies.
On another level, the OP hasn't indicated whether or not he's had any military or paramilitary training himself. While I suppose that there's some low key groups of people with decent military training who might be engaging in interesting activities, at least a very noticeable proportion of militia groups can be rather amateurish in their training and overall presentation of themselves. Such groups are not likely to be very effective in any crisis and often provide a good punching bag for those who want to portray their opponents on the right as dangerous extremists. Unless the OP has had military training or know some close friends who did that have and can vouch for the quality of a group, he might find him or herself playing soldier with a bunch of self appointed Majors and Colonels who'll provide little more than can be achieved through camping and shooting with friends (and that without getting flagged as a threat to national security).
Personally, I think it would be a better use of one's time to develop their personal resilience (through acquiring skills and some gear/supplies so long as one learns how to use them) while cultivating networks with likeminded people through different means than joining a militia (i.e. Church groups, amateur radio clubs, hunting and shooting clubs, Search and Rescue groups, the Red Cross, veterans and veterans groups, plus various survivalist and homesteaders groups, conventions, etc.). If push came to shove, those networks of people would probably carry a great deal of capabilities and influence without being the first targets of any government clampdown. And even if the government were to become truly tyrannical, it might be far more effective for people to organize their opposition along the lines of the Solidarity movement in Poland than the high-flung scenarios of civil war involving armed civilians so freely thrown about.
I won't tell anyone here what to do, but highly counsel researching this matter very thoroughly (and cautiously) before getting deeply involved.