SAN ANTONIO, Texas (May 27, 2021) Dr. Sylvain Cardin, Chief Science Director for Naval Medical Research Unit-San Antonio delivers the unit's command briefing inside a conference room of the Battlefield Health and Trauma Building on Joint Base San Antonio-Fort Sam Houston May 27, 2021. Cardin holds a Ph.D. in exercise physiology. Cardin's audience was members of NAMRU-SA and Brig. Gen. Katherine Simonson, Defense Health Agency's Deputy Assistant Director for Research and Development. (U.S Navy photo by Randy Martin)