The franchise has been owned by Diamond Sports & Entertainment, primary investors in the current North American League (NAL), since 2005.

They began play in May 2005, three years after their predecessors, the Long Beach Breakers, folded along with the Western Baseball League.

The City of Long Beach made an arrangement to either sell or provide a long-term lease to Long Beach State University for the college to take over the maintenance and cost of running Blair Field, but first had to revoke the Armada's permit, which was standing in the way of completing a deal and had usage and concessions rights.

One month later, in March 2008, the Long Beach Armada signed former Major League Baseball pitcher Jerome Williams.

[4] Other ex-major leaguers who have played for the Long Beach Armada include Bud Smith, Nick Bierbrodt, Adam Pettyjohn (the only Armada to have made it back to the big leagues from the club), Mark Quinn, Alan Newman, Chris Wakeland, Cleatus Davidson, Steve Smyth, and Seth Etherton.