According to the last verse of the Air Force Song, what should flying men do to live long?

The last verse of the Air Force Song emphasizes the importance of maintaining an unwavering and steady approach to flying. When it encourages flying men to "keep the wings level and true," it serves as a metaphor for stability, discipline, and adherence to proper flying techniques. This line underlines the idea that by being careful, focused, and consistent in their flying practices, pilots can enhance their safety and longevity in their careers.

In aviation, particularly within military contexts, being "level and true" reflects the fundamentals of sound navigation and aircraft control. This approach is critical for not just the safety of the pilots themselves but also for the successful completion of their missions. Such principles help ensure that pilots can operate effectively without unnecessary risks and distractions.

The other answer options imply a more reckless or less disciplined approach to flying, which contradicts the values promoted in military aviation. Methods that involve risky maneuvers or challenging the limits can increase danger and are not aligned with the ethos of operational safety and professionalism emphasized in Air Force training.