June 19, 2022 Juneteenth: the last vestige of slavery ends Juneteenth is celebrated as a federal holiday June 20, 2022, after becoming an official holiday in 2021 by an executive order from President Joe Biden.
April 22, 2021 Air Force rewrites basic doctrine, focuses on mission command, airpower evolution Core themes to the revised Air Force Doctrine Publication-1: The Air Force are the foundation and evolution of airpower and the concept of mission command.