Rob Seever joined a start up militia in Fallon, Nevada, started by Corey Lequieu in January 2015. He had been a reserve deputy in Yamhill County and a clerk of a District Attorney in Washington, before moving to Nevada. He met Lequieu through Modern Militia Movement (MMM). Lequieu and Seever became close friends over the following months.
Lequieu had been active with Operation Mutual Aid (OMA), an organization created by Jerry Bruckhart and Ryan Payne. Many of those who participated in discussions appended "OMA" to their Facebook names and otherwise express their commitment to what OMA stood for.
Among those OMA supporters were Robert Beecher (the Demonization of Robert Beecher) and Kevin "KC" Massey (Update #1 on K. C. Massey). The government targeted both of them, and both are currently serving prison terms. It seems that the OMA membership list may have become a hit list for the FBI.