Video: Orion countdown status briefing

Jeremy Graeber, Orion recovery director, details how the NASA-Navy team will handle the Exploration Flight Test No. 1 after it splashes down in the Pacific Ocean.

In a major shakeup at NASA Headquarters, agency Administrator Jim Bridenstine said Wednesday that Bill Gerstenmaier, the widely respected director of human spaceflight, has been replaced in the midst of an ambitious push to meet the Trump administration’s directive to send astronauts back to the moon within five years.

Reid Wiseman, a veteran U.S. Navy test pilot and former chief of NASA’s astronaut corps, will lead the four-person crew assigned to the Artemis 2 mission to carry people to the vicinity of the moon for the first time in more than 50 years. Wiseman says he views the crew’s job as making sure NASA’s Orion spacecraft is ready for more demanding missions later this decade to support moon landings and assembly of a space station called the Gateway in lunar orbit.