LANGLEY AIR FORCE BASE, Va. -- Coach Doug Merrill, ultra-marathon runner and author of "Fighting the Demons of Suicide," speaks to Langley Airmen Dec. 1 about achieving positive mental health through physical fitness. As a motivational speaker, Coach Merrill encourages young adults to stay active, achieve goals, and watch for suicidal symptoms in friends and family members. (U.S. Air Force photo/Airman 1st Class Gul Crockett)