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NASA has announced two veteran space shuttle engineers have taken charge of space agency’s Space Launch System and Orion deep space exploration projects after their previous managers both took the No. 2 jobs at space centers in Alabama and Texas.

Lessons learned during preparations leading up to the first orbital test flight of NASA’s Orion spacecraft in December have prompted engineers to recommend changing the design of the crew capsule’s heat shield for future missions to the moon, Mars, or an asteroid, according to Lockheed Martin officials.

The budget proposal coming from the White House would also reduce spending on the International Space Station program by more than $500 million.