NASA Administrator Jim Bridenstine participates in a press preview event in Washington, U.S.More

By Joey Roulette

ORLANDO, Fla. (Reuters) – As NASA scrambles to meet U.S. President Donald Trump’s mandate to return humans to the moon by 2024, two longtime heads of NASA’s human exploration wing were demoted Wednesday in a slew of administrative shakeups, officials said in an internal memo.

The biggest change to rock the agency is the demotion of Bill Gerstenmaier, who was leading the efforts to return humans to the lunar surface.

He has been with the agency since 1977, led some of its most high profile programs and was the head of the human exploration office in a 14-year tenure.

The agency’s chief Jim Bridenstine announced the changes in an internal memo to

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