Dr. Dan Breton is working to provide extended radio communications with the Marines through manipulation of frequencies to suit the environment. In the photo, a Marine makes radio contact with base camp, while participating in the Mountain Warfare Training Center’s Mountain Communications course. The course’s Mountain Mobility portion consists of navigating nearly nine miles over the Sierra Nevada Mountain, while maintaining communications with the base camp along the way. Breton is a researcher with the U.S. Army Cold Regions Research and Engineering Laboratory.