170302-N-GA424-026 SAN ANTONIO (March 2, 2017) Hospital Corpsman 1st Class Elizabeth Sifuentes, a medical laboratory technician instructor at the Medical Education and Training Campus (METC), adjusts a microscope for students from John Marshall High School during a tour of METC at Joint Base San Antonio-Fort Sam Houston, Texas. (U.S. Navy photo by Mass Communication Specialist 1st Class Jacquelyn D. Childs/Released)