Mark Sirangelo, Special Assistant to the NASA Administrator, was hired to get America back to the Moon in 2024. He resigned just 6 weeks into the job, after Congress knocked back extra funding for the effort. A 21st century lunar landing continues to recede into the distant future due to political infighting, budget constraints and heated debate about long-term plans for American human spaceflight.
Further Reading
NASA executive quits weeks after appointment to lead 2024 moon landing plan