They were formed as a combat unit in the spring of 1941. From all parts of the United States they came — young, fearless and thirsty for adventure. Well-trained and highly qualified, they fiew the powerful Boeing B-29 Superfortress, the biggest and deadliest bomber of World War II. With it, they bombed the Japanese from their base on Tinian Island in the Marianas. They were the crews of the 40th Bomb Group.