There are many AMERICANS WHO ARE ARMED.
Many Americans are armed, this is true. But without mission, organization, and leadership, we are just so many atomized individuals with guns in our safes.
The best answer I have gotten so far is for patriots to organize locally; churches, neighborhoods, gun & range clubs, etc. These groups in theory could coalesce if a national threat emerged such as regular military deployed against citizens (illegal under Posse Commitatus) or a rogue state government starts going door to door.
Until then, we are but a vague force against tyranny defined as a rifle behind every blade of grass. But then, that deterred the Japs in WWII, did it not?