SpaceX announced the final two new members for its civilian crew team, preparing to launch the first all-civilian mission to space on the company’s Dragon spacecraft this fall.

Chris Sembroski, 41, an Air Force veteran working for Lockheed Martin, and Dr. Sian Proctor, 51, an entrepreneur, educator, and trained pilot, were revealed on Tuesday as the final two members of the four-person crew, NBC’s Today reported.