Riding a half-million pounds of thrust, a Minotaur 4 rocket fired off a launch pad in Virginia, surpassed the speed of sound in less than 20 seconds, and vaulted into orbit Wednesday with four classified payloads for the National Reconnaissance Office.

Rocket Lab’s second mission of 2021 lifted off at 6:30 p.m. EDT (2230 GMT) Monday from New Zealand carrying six small satellites for customers in Australia and the United States, along with a test platform for a NASA small satellite mission to the moon launching later this year.

NASA hopes to have a new leader for the agency’s human spaceflight directorate by the end of the year to replace Bill Gerstenmaier, who held the post for nearly 14 years before his reassignment in July amid the Trump administration’s push to land humans on the moon by 2024, a NASA official said Wednesday.