ARCTUS (the "Advanced Research and Conventional Technology Utilization Spacecraft") was a proposed design by Astrotech Corporation and developed with its partners Lockheed Martin, United Launch Alliance, Cimarron and Odyssey Space Research for a robotic spacecraft that would deliver cargo to the International Space Station, NASA COTS program. ARCTUS was planned to be launched by an Atlas V rocket. Its pressurized cargo module would return to Earth and be recovered with a mid-air retrieval operation.