Chief Master Sgt. Rodney Christa, 433rd Aerospace Evacuation Squadron superintendent, explains C-17 aircraft operations to Dr. David Lakey, commissioner of the Department of State Health Services (DSHS), prior to takeoff. Dr. Lakey boarded the C-17 at Lackland Air Force Base, Texas, Feb. 7 to learn about the C-17 and its medical evacuation capabilities. (TXMF photo by Tech. Sgt. Rene Castillo)