The People of the Crater, The Original Sci Fi Classic Novel

Six months and three days after the Peace of Shanghai was signed and the great War of 1965-1970 declared at an end by an exhausted world, a young man huddled on a park bench in New York, staring miserably at the gravel beneath his badly worn shoes. He had been trained to fill the pilot's seat in the control cabin of a fighting plane and for nothing else. The search for a niche in civilian life had cost him both health and ambition.
A newcomer dropped down on the other end of the bench. The flyer studied him bitterly. He had decent shoes, a warm coat, and that air of satisfaction with the world which is the result of economic security. Although he was well into middle age, the man had a compact grace of movement and an air of alertness.
"Aren't you Captain Garin Featherstone?"
Startled, the flyer nodded dumbly.