OMAC (Buddy Blank)

O.M.A.C. ("One Man Army Corps") is a DC Comics character, originally a superhero in a futuristic setting, although reinvented a few times since. It was created by artist Jack Kirby during his tenure at DC in the 1970s. He first appeared in "OMAC" #1 (September, 1974). The series only lasted for 8 issues, ending in December, 1975.
The original OMAC was Buddy Blank, a janitor who was chosen by the secret organization called the Global Peace Agency to be their super soldier against the forces of the evil megacorporations that were taking over the world. With the aid of a sentient orbiting satellite called Brother Eye, OMAC tried to prevent a power struggle that would destroy civilization.
He failed.
In fact, Buddy was the old man who raised Kamandi, The Last Boy On Earth (another Kirby series) several years after the mysterious Great Disaster shattered the world. He died in the first issue, leaving Kamandi to roam alone the strange new world Earth had become.