Portraits of past House Science and Technology Committee Chairmen, Sherwood Boehlert, left, and Ralph Hall are seen as NASA Associate Administrator, Human Exploration and Operations William Gerstenmaier testifies during a 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)