A.T.F. officer assigned to investigate the cult helmed by the Seth, north of Seattle, Washington. When the Air Force arrived on the scene Hamner was understandably distraught, believing SG-1 was going to disrupt or relieve him of his operation. After Jack O'Neill made a phone call to the President, the Commander-in-Chief instructed Agent Hamner to personally provide whatever backup O'Neill saw fit.
Hamner and his unit rendered aid to evacuate Seth's followers and overtake the fortified area. But he remained unaware that their target was in truth a Goa'uld.
Seth - Hamner of the A.T.F. arrives north of Seattle to oversee the investigation into Seth and his outpost.