U.S. Air Force Airmen assigned to the 18th Medical Group navigate through tall grass during a navigation exercise during the Preventative Aerospace Medicine Convention April 21, 2017, at Kadena Air Base, Japan. Airmen from public health, bioenvironmental, flight medicine and other units within the 18th MDG led hands-on training activities in order to better prepare and understand the requirements when establishing and supporting an operational site in a deployed environment. (U.S. Air Force photo by Airman 1st Class Quay Drawdy)