"Although the Air National Guard was not established as a separate component of the U.S. Air Force until 1947, National Guard aviators have played significant roles in all of America's wars and most of its major contingencies since the beginning of the 20th Century."
This is probably where the democrats got their 'talking point' from.
If so, then they got it backwards, because it means that the ANG became a separate component of the USAF in 1947.