Gannon Senior was an Enclave officer after the destruction of the Oil Rig. After his death in combat, his family tried to integrate into the NCR, but they ended up settling in the Mojave Wasteland. He has a son named Arcade.
Gannon Senior was an Enclave officer stationed at Navarro. He was in the same squad as Cannibal Johnson, Judah Kreger, Orion Moreno, Doctor Henry, and Daisy Whitman. He wore Gannon family Tesla armor in his last mission, which was later given to his son. Arcade Gannon, his son, is obviously reluctant to speak of him, showing his shady background.
Gannon Senior is mentioned in Fallout: New Vegas.