NASA exec leading moon mission quits weeks after appointment

A NASA executive tasked with leading the strategy to return U.S. astronauts to the moon has stepped down just six weeks after his appointment.

Mark Sirangelo was tapped in April as special assistant to NASA Administrator Jim BridenstineJames (Jim) Frederick BridenstineFrom Apollo 11 to Artemis: This time when we go back to the moon, we are going to stay Trump meets with Apollo 11 astronauts to mark moon landing anniversary Trump's NASA administrator talks efforts to return to Moon MORE, but he is leaving the agency after NASA's proposal of a new organizational structure to support the lunar campaign was not accepted by Capitol Hill.

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Bridenstine announced late Thursday that because NASA is "no longer pursuing the new mission directorate," Sirangelo "has opted to pursue other opportunities."

"We are exploring what organizational changes ... are necessary to ensure we maximize efficiencies and achieve the end state of landing the first woman and next man on the Moon by 2024," Bridenstine said in a statement obtained by The Hill.

"I want to personally thank Mark for his service and his valuable contributions to the agency," Bridenstine added. 

Vice President Pence said in March that the administration is committed to landing astronauts on the moon within five years, marking the administration’s most concrete timeline to the lunar surface. 

President TrumpDonald John TrumpChelsea Clinton announces birth of third child Ukrainian officials and Giuliani are sharing back-channel campaign information: report Trump attacks 'the Squad' as 'racist group of troublemakers' MORE also announced earlier this month that his budget would include an additional $1.6 billion for NASA, saying the U.S. is "going back to the Moon, then Mars."

Also on Thursday, NASA announced a $375 million contract to Maxar Technologies to develop power and propulsion capabilities for the lunar mission.

Updated at 8:43 a.m.