U.S. Air Force Senior Airman Tristian Riley, 423rd Medical Squadron laboratory technician, reads the instructions for assisting Airman Shalie Cino, a simulated casualty, in the first-ever joint mass-casualty medical training between the 423rd MDS and the 423rd Civil Engineer Squadron at RAF Alconbury, England, May 21, 2019. The training between medical specialists and firefighters enhanced their rapid response to mass-casualty situations. (U.S. Air Force photo by Airman 1st Class Jennifer Zima)