Two-Stage Light Gas Gun (IMAGE) Southwest Research Institute Caption The two stage light gas gun at Southwest Research Institute's San Antonio headquarters was instrumental in a new study focusing on the conditions of hypersonic flight. Credit Southwest Research Institute Usage Restrictions Images/videos may be used by the media and the public for educational and informational purposes only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.