What is the birthday of the U.S. Air Force?

The correct answer, September 18, 1947, marks the official establishment of the United States Air Force as a separate branch of the U.S. Armed Forces. On this date, the National Security Act of 1947 was enacted, which transformed the Army Air Forces into the United States Air Force, thus recognizing it as an independent military service distinct from the Army.

This momentous decision was part of a broader reorganization of the U.S. military after World War II and aimed to address the evolving nature of aerial warfare and defense strategy. By becoming a separate entity, the Air Force could better focus on its unique mission and responsibilities.

The other dates mentioned do not correspond to the establishment of the Air Force. For instance, May 15, 1948, is not significant in the same sense, and neither is October 10, 1951, nor February 14, 1945. Each of these dates relates to different events or entities within military history, but September 18, 1947, is exclusively recognized as the birthdate of the U.S. Air Force.