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180206-N-UJ980-115 SAN DIEGO (Feb. 6, 2018) Capt. Joel Roos, Naval Medical Center San Diego (NMCSD) commanding officer, third from right, visits the Naval Health Research Center’s (NHRC) and meets with researchers studying human performance optimization. During the visit, Roos toured the Warfighter Performance Laboratory, a 6,000 square-foot space with an immersive virtual reality environment, environmental chamber, swim flume, functional fitness area, and a two-bedroom sleep and fatigue lab. (U.S. Navy photo by Regena Kowitz/Released)