Elon Musk, SpaceX chief engineer, speaks with U.S. Air Force Lt. Gen. John Thompson, Space and Missile Systems Center commander and program executive officer for space, during a question-and-answer session during the first day of U.S. Air Force Space Pitch Day, Nov. 5, 2019, in San Francisco. Air Force Space Pitch Day is a two-day event hosted by the Air Force to demonstrate the service’s willingness and ability to work with non-traditional startups and small businesses. (U.S. Air Force photo by Senior Airman Christian Conrad)