James R Zimbelman, Smithsonian National Air and Space Museum, Washington, DC, United States, Stephen P Scheidt, Smithsonian Institute, Washington, DC, United States, Andrew Valdez, Great Sand Dunes National Park and Preserve, Resource Management Division, Mosca, CO, United States, Alexander M Morgan, Smithsonian Institution, Center for Earth and Planetary Studies, National Air and Space Museum, Washington, DC, United States, Andrew K Johnston, Smithsonian Institution, Washington, DC, United States and Andrew Johnston