160927-N-N1526-001 CAIRO, Egypt (Sept. 27, 2016) Capt. John Gilstad, right, is relieved by Capt. Andrew Vaughn as commanding officer, U.S. Naval Medical Research Unit 3 as Capt. Jacqueline Rychnovsky, center, commanding officer, Naval Medical Research Center, presides over the change of command ceremony held in Cairo, Egypt, Sept. 27, 2016. An integral part of Navy Medicine's research and development, U.S. Naval Medical Research Unit 3 is one of three overseas infectious disease and surveillance activities. (U.S. Navy photo/Released)