U.S. Air Force Master Sgt. Michael Guderyon conducts research using stem cells in San Antonio, Texas, March 20, 2018. A Citizen Reserve Airman with the 307th Maintenance Squadron, Guderyon is also a doctoral student studying methods to conduct bone marrow transplants in a less invasive manner. The research is designed to help cure a host of diseases and extend the life of patients. (Courtesy photo by Charlotte Anthony)