America's Best Comics #21

This anthology issue features "The Joke's on Youth" by Al Harvey, a humorous story about a young person who makes multiple mistakes while helping adults, including an incident involving ice cream cones and a man crying outside. The issue also includes a story featuring the Fighting Yank battling uniformed terrorists and murderers, involving a mysterious plot with whistles heard everywhere, a town hall confrontation, and action involving a fighter plane and anti-aircraft weapons being deployed to stop the villains.