CAMP LEMONNIER, Djibouti (April 23, 2021) Hospital Corpsman 2nd Class Wei Xu, from Lemoore, Calif., prepares a swab sample for COVID-19 testing at the Naval Medical Research Unit (NAMRU) at Camp Lemonnier on April 23, 2021. The NAMRU team has done thousands of lab tests since spring, 2020. In support of joint U.S. warfighters, the NAMRU researches and tracks of infectious diseases, environment health concerns and epidemiology and behavioral sciences, to support military personnel deployed to Africa, the Middle East, and Southwest Asia. (U.S. Navy photo by Mass Communication Specialist 1st Class Natalia Murillo)