Landing 300 rockets means SpaceX has preserved 2,700 Merlin rocket engines. In round numbers, the dry mass of a Falcon 9 first stage is about 50 metric tons, so the landing of all these rockets has prevented 15,000 metric tons of metal and other materials from being dumped into the oceans—the equivalent, in mass, of about 100 residential homes.

SpaceX sent up the 30th launch from the Space Coast for the year on the evening of April 23, a mission that also featured the company's 300th successful booster recovery.

SpaceX is set to send up the 30th launch on the Space Coast this year targeting an evening liftoff Tuesday that would see the 300th booster recovery if successful.