While serving as an operative for FOX, Gene spent years gathering funds, resources and troops in order to form his Army's Heaven nation that would control the world from "behind the shadows" led by a nation of mercenaries consisting only of those of superior talent. It was intended to act as an intangible, shadowy organization hidden underground that would intervene in all conflicts throughout the world. The aim was to break free from the rule of the Philosophers, which had lost much political strength. At the root was Gene's idea that superior military force should be used to achieve superior will, instead of being at the mercy of national interests or the tactics of inneffectual governments. By disrupting the global balance of power, Gene intended to end the Philosophers in accordance with his interpretation of The Boss's will.
- Main article: San Hieronymo Incident
In late 1970, Gene commanded the FOX unit to commence an armed takeover the San Hieronymo Peninsula, the site of a secret abandoned Soviet missile base. It was here that he intended to bring about the first steps in his creation of Army's Heaven, with the help of the fellow FOX members Cunningham, Python, Ursula, Null and former members of the Red Army.
Before Gene could launch Metal Gear into the United States in order to weaken the Philosophers, he was confronted by Naked Snake (Big Boss) intent on clearing himself of any involvement in FOX's rebellion. Before their battle began, the FOX commander attempted to convince him to join his side by revealing his ultimate plan. Gene viewed humans as fragile creatures who needed someone of superior will to give them a calling; compared to his mission, the individual wills of individual soldiers were meaningless. However, the former FOX agent disagreed with his philosophy, stating that Gene used fear and deception to keep his soldiers in line, and that his exploitation of soldiers was unethical. He also argued that the place they were looking for lay outside Gene's "heaven."
Nearing death after an intense duel, Gene passed the wealth and resources he had accumulated for Army's Heaven onto Snake, urging him to find his own calling and remain loyal to himself. Ultimately, Gene's plans of bringing about Army's Heaven were foiled when Snake and his allies prevented the launch of Metal Gear.