Col. Luther Manning, the first Deathlok, debuted in Astonishing Tales #25 (May 14, 1974).
Astonishing Tales #25 – A Cold Knight’s Frenzy! released by Marvel
Behold! The birth of the cyborg known as Deathlok! Military strategist Col. Luther Manning loses his humanity in a post-apocalyptic science experiment. Now, trapped in an amalgam of flesh and circuitry, Deathlok lives between life and death, man and robot.