President Donald Trump's proposed sixth military service, the Space Force, will fall within the Department of the Air Force if approved by Congress, according to a directive he signed Feb. 19. The Pentagon will include funding for the Space Force in its fiscal 2020 budget proposal, which is expected to be sent to Congress next month, White House officials said Tuesday, speaking on condition of anonymity. The officials indicated start-up costs for the Space Force would be about $100 million, far less than the Pentagon's initial estimate of $13 billion. Read more about the directive on Military.com.