A Russian cosmonaut, a NASA astronaut and a British flier strapped into a Soyuz spacecraft, undocked from International Space Station and plunged back to Earth Saturday, safely landing on the steppe of Kazakhstan to close out a 186-day mission.

A solid-fueled Minotaur 4 rocket lifted off from Wallops Island, Virginia at 9:46 a.m. EDT (1346 GMT) Wednesday. The four-stage rocket, comprised of retired Peacekeeper missile parts, launched on a mission to deliver four classified payloads into orbit for the National Reconnaissance Office.

In a rapid-fire crew exchange, three space station fliers return to Earth Friday morning, landing on the steppe of Kazakhstan just four days before their replacements blast off from the Baikonur Cosmodrome a few hundred miles away, boosting the lab’s crew back to six.