Lt. Col. Jaime Hernandez, 28th Bomb Wing chief of safety, briefs Airmen on winter safety during Comprehensive Airman Fitness Day activities in the Pride Hangar at Ellsworth Air Force Base, S.D., Nov. 4, 2013. CAF Day focused on the mental fitness pillar and potential safety threats in winter months. (U.S. Air Force photo by Senior Airman Zachary Hada/Released)