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Air Force Chief of Staff Gen. Mark A. Welsh III retires after 40 years of service in a ceremony at Joint Base Andrews, Md., June 24, 2016. Welsh has served as the 20th chief of staff since 2012. (U.S. Air Force photo/Scott M. Ash)




Air Force Chief of Staff Gen. Mark A. Welsh III retires after 40 years of service in a ceremony at Joint Base Andrews, Md., June 24, 2016. Welsh has served as the 20th chief of staff since 2012. (U.S. Air Force photo/Scott M. Ash)

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U.S. Space Force Col. Mike S. Hopkins, NASA astronaut, tours the operations floor of 4th Space Operations Squadron during his daylong visit to Schriever Space Force Base, Colorado, Jan. 27, 2022. Space Delta 8 – Satellite Communications and Navigational Warfare, 4th SOPS provides warfighters global, secure, survivable, strategic and tactical communication during peacetime and throughout the full spectrum of conflict. (U.S. Space Force photo illustration by Tiana Williams)
U.S. Space Force Col. Mike S. Hopkins, NASA astronaut, spoke with Airmen and Guardians during his visit to Schriever Space Force Base, Colorado, Jan. 27, 2022. During the Q&A session, Hopkins discussed life in space and his career as an Airman, Guardian and Astronaut. (U.S. Space Force photo by Tiana Williams)
U.S. Space Force Col. Mike S. Hopkins, NASA astronaut, visits Schriever Space Force Base, Colorado, as part of a larger trip to several bases across the Front Range, Jan. 27, 2022. During his visit, he spoke about his time on the International Space Station and answered questions from Airmen and Guardians about his U.S. Air Force, U.S. Space Force and NASA experiences. (U.S. Space Force photo by Tiana Williams)