The discussion centers on an official training film about flying the B-26 bomber. Participants note the simplicity of radio communication in the film, highlighting the use of terms like "Wilco" and "Roger" without read-backs, which contrasts with modern practices that emphasize clarity and safety. This lack of read-backs is attributed to historical incidents involving crashes, suggesting that such protocols evolved from past mistakes. Additionally, a contributor draws parallels to military radio communication, emphasizing brevity to avoid revealing positions during wartime. The conversation also touches on the inefficiency of lengthy pre-flight checklists, humorously suggesting that they would take too long in a wartime context. Overall, the thread reflects on the evolution of aviation communication and safety protocols.