We can start this in a far simpler way;
We are now Re-enactors. All of us. We re-enact modern military battles and tactics using appropriate replica equipment that is designed to be harmless.
We follow all the rules established currently by the Federal Government. We are all over 18. We all do these events in authorized areas. We educate the public (even someone just walking off the street) and the police forces about what we do in a sane and considerate manner.
We also from now on watch exactly what we do or say in public.
All of the above we can do right now, immediately, at no cost.
Then when the structure of the group is established on paper, we can be fully ready to step in.
Let's start small, because that works well. Let's start HERE, because it's already setup.