SpaceX is preparing to launch its 400th Falcon 9 rocket, marking the company's 100th launch from the West Coast.The Starlink 9-13 mission will carry 20 V2 Mini satellites, including 13 with Direct to Cell capabilities.The Falcon 9 first stage booster, B1075, will be used for the 15th time and is expected to land on the SpaceX droneship, 'Of Course I Still Love You'.If successful, this will be the 110th booster landing on OCISLY and the 373rd booster landing overall.