When was the Air Force established?

The Air Force was established on September 18, 1947, marking a significant moment in U.S. military history. This date is when the National Security Act of 1947 came into effect, officially making the United States Air Force a separate and distinct branch of the Armed Forces. Prior to this, air power was primarily a component of the Army, and the establishment of the Air Force underscored the importance of aviation in modern warfare and national defense strategies. This change recognized the need for a dedicated force to manage air operations, reflecting the technological advancements and the evolving nature of military engagements following World War II.

The other dates represent significant milestones in military history but are not related to the formation of the Air Force. For example, August 4, 1790, is associated with the establishment of the Revenue Cutter Service, which became part of the Coast Guard. June 14, 1775, is known as the founding date of the U.S. Army, and November 10, 1775, marks the birth of the U.S. Marine Corps. Each of these branches has its own distinct history and timeline, separate from that of the Air Force.