Assertion: air force | /r/HasProperty | established as independent service
Facets:
value: on 18 september
type: TEMPORAL
Source sentences:
text: The United States Air Force was established as an independent service on 18 September 1947; it traces its origin to the formation of the Aeronautical Division, U.S. Signal Corps, which was formed 1 August 1907 and was part of the Army Air Forces before becoming an independent service as per the National Security Act of 1947.