The United States Air Force (USAF) is the aerial warfare branch of the United States Armed Forces which was created under the National Security Act of 1947 signed President Harry S Truman. The Air Force ended a 40-year association with the U.S. Army to become a separate service two years after the ...

The United States Air Force (USAF) is the aerial warfare branch of the United States Armed Forces which was created under the National Security Act of 1947 signed President Harry S Truman. The Air Force ended a 40-year association with the U.S. Army to become a separate service two years after the World War II when the world entered a new era in which airpower became firmly established as a major element of the nation's defense and one of its chief hopes for deterring war.