NASA Administrator Bill Nelson is seen leaving the Tomb of the Unknowns with Executive Director of the Office of Army Cemeteries, Karen Durham-Aguilera, after a wreath laying ceremony as part of NASA's Day of Remembrance, Thursday, Jan. 26, 2023, at Arlington National Cemetery in Arlington, Va. The wreaths were laid in memory of those men and women who lost their lives in the quest for space exploration. Photo Credit: (NASA/Aubrey Gemignani)

NASA Administrator Bill Nelson is escorted to the Tomb of the Unknowns for a wreath laying ceremony by Executive Director of the Office of Army Cemeteries, Karen Durham-Aguilera, as part of NASA's Day of Remembrance, Thursday, Jan. 25, 2024, at Arlington National Cemetery in Arlington, Va. The wreaths were laid in memory of those men and women who lost their lives in the quest for space exploration. Photo Credit: (NASA/Keegan Barber)

NASA Administrator Bill Nelson speaks with Executive Director of the Office of Army Cemeteries, Karen Durham-Aguilera, prior to a wreath laying ceremony as part of NASA's Day of Remembrance, Thursday, Jan. 25, 2024, at Arlington National Cemetery in Arlington, Va. The wreaths were laid in memory of those men and women who lost their lives in the quest for space exploration. Photo Credit: (NASA/Keegan Barber)

NASA Administrator Jared Isaacman, right, and Executive Director of the Office of Army Cemeteries Karen Durham-Aguilera, left, watch the changing of the guard at the Tomb of the Unknowns as part of NASA's Day of Remembrance, Thursday, Jan. 22, 2026, at Arlington National Cemetery in Arlington, Va. Wreaths were laid in memory of those men and women who lost their lives in the quest for space exploration. Photo Credit: (NASA/Keegan Barber)

NASA Administrator Jared Isaacman, right, and Executive Director of the Office of Army Cemeteries Karen Durham-Aguilera, left, watch the changing of the guard at the Tomb of the Unknowns as part of NASA's Day of Remembrance, Thursday, Jan. 22, 2026, at Arlington National Cemetery in Arlington, Va. Wreaths were laid in memory of those men and women who lost their lives in the quest for space exploration. Photo Credit: (NASA/Keegan Barber)

NASA Administrator Bill Nelson is escorted to the Tomb of the Unknowns for a wreath laying ceremony by Executive Director of the Office of Army Cemeteries, Karen Durham-Aguilera, as part of NASA's Day of Remembrance, Thursday, Jan. 26, 2023, at Arlington National Cemetery in Arlington, Va. The wreaths were laid in memory of those men and women who lost their lives in the quest for space exploration. Photo Credit: (NASA/Aubrey Gemignani)

NASA leadership and guests watch the changing of the guard at the Tomb of the Unknowns as part of NASA's Day of Remembrance, Thursday, Jan. 22, 2026, at Arlington National Cemetery in Arlington, Va. Wreaths were laid in memory of those men and women who lost their lives in the quest for space exploration. Photo Credit: (NASA/Keegan Barber)