![Sandra Greene, left, and Cynthia Sprader recently completed test firings to gather acoustic data on the SLS engines.](https://www.nasa.gov/wp-content/uploads/2023/03/photo1.jpg)
Sandra Greene and Cynthia Sprader at Test Stand
Propulsion engineer Sandra Greene, left, and test engineer Cynthia Sprader recently completed a series of test firings at the Marshall Center.
- X
https://www.nasa.gov/image-detail/sandra-greene-cynthia-sprader-test-stand-2/
Size1041x746px