When was the United States Air Force established?

The United States Air Force was established on September 18, 1947, marking its official separation from the United States Army as an independent military service. This date is significant as it represents the recognition of air power as a vital component of national defense, acknowledging the contributions of aviation to military operations during World War II and the subsequent Cold War era. The establishment of the Air Force allowed for a more focused development of airpower capabilities, strategies, and policies, further emphasizing its importance in modern warfare.

The other options represent important historical military events but do not pertain to the establishment of the Air Force. June 14, 1775, is recognized as the founding date of the Continental Army, which laid the groundwork for the current U.S. Army. April 6, 1917, marks the United States' entry into World War I. December 7, 1941, is remembered for the attack on Pearl Harbor, which led the U.S. to enter World War II. However, none of these dates are related to the creation of the Air Force.