Final answer:
Ira Eaker convinced Winston Churchill to allow US air forces to bomb German military targets with greater precision during daytime hours.
Step-by-step explanation:
The Oklahoma general who convinced UK Prime Minister Winston Churchill to allow US air forces to bomb German military targets with greater precision during daytime hours was Ira Eaker.
In June of 1943, the US and the UK agreed that the US would conduct precision bombing of industrial and military targets during the day, while British bombers would area bomb cities by night. This strategy aimed to weaken Germany's ability to make war. Eaker played a key role in convincing Churchill of the effectiveness and importance of the daytime bombing operations.
This decision marked a shift in bombing strategy and contributed to the eventual success of the Allied forces in World War II.