NASA Associate Administrator, Human Exploration and Operations William Gerstenmaier, left, and NASA Special Assistant to the Administrator Mark Sirangelo, watch as a video is played during the House Subcommittee on Space and Aeronautics hearing titled "Keeping our sights on Mars: A Review of NASA's Deep Space Exploration Programs and Lunar Proposal", Wednesday, May 8, 2019 at the Rayburn House Office Building in Washington. Photo Credit: (NASA/Bill Ingalls)