United States Air Force Celebrates Its 71st Birthday Posted on September 18, 2018 by nwvuwebmaster 18 September 1947 In 1947 President Truman signed the National Security Act which established this new defense organization, and along with it the creation of the US Air Force as an independent service, equal to the US Army and US Navy. Follow Share Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related