A member of the Mercy Air flight crew speaks to Airmen at the Mike O’Callaghan Military Medical Center, Nellis Air Force Base, Nev., March 13, 2019. Mercy Air aircraft are available 24 hours a day, seven days a week, with overlapping service areas of coverage that help ensure a helicopter is readily available for your needs. (U.S. Air Force photo by Airman 1st Cass Bailee A. Darbasie)