Which of the following individuals was not related to the founding of the Marine Corps' aviation?

Robert E. Lee did not play a role in the founding of Marine Corps aviation. The development of Marine Corps aviation is primarily attributed to pioneering figures who were directly involved in establishing and expanding air operations within the Marine Corps.

Alfred Cunningham is significant as he was the first Marine aviator and played a crucial role in establishing aviation as a vital component of the Marine Corps. Samuel Nicholas is recognized as the first Commandant of the Marine Corps and contributed to the organizational structure that would eventually support air operations. Jacob Zeilin, the 7th Commandant, also contributed to the evolution of the Marine Corps, including its aviation efforts.

In contrast, Robert E. Lee was a prominent Confederate general during the Civil War and was not connected to the establishment or development of Marine aviation, making him the outlier among the listed individuals.