The following events happened on this day of September 18:
- US response to initial 1947 UFO crashes
- September 18, 1947 - United States Department of Defense (DoD) is established.
- September 18, 1947 - Central Intelligence Agency (CIA) is established.
- September 18, 1947 - United States Air Force is re-outfitted as an independant arm of the United States.
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