The House Armed Services Committee recently approved a version of the 2018 military budget that includes the creation of a sixth military branch — the Space Corps.
Today, the military consists of the Army, Navy, Marine Corps, Coast Guard, and Air Force. A new branch has not been added since the Air Force in 1947.
According to the 2018 National Defense Authorization Act, the Space Corps would take over duties currently handled by the Air Force and its Space Command. Then, it would relate to the Air Force in the same way the Marine Corps relates to the Navy.