161025-N-PZ713-022 SAN DIEGO (Oct. 25, 2016) Dr. Rachel Markwald, left, talks to Deputy Assistant Secretary of Defense for Research, Dr. Melissa L. Flagg (right), about the Sleep and Fatigue Lab at Naval Health Research Center (NHRC). Markwald and her team study the effects of sleep loss and fatigue on warfighter health and performance. As the DoD's premier deployment health research center, NHRC's cutting-edge research and development is used to optimize the operational health and readiness of the nation's armed forces. (U.S. Navy photo by Mayra A. Conde)