Army Col. (Dr.) Derron A. Alves, director of the Defense Department's Veterinary Pathology Residency Program, examines microscopic tissue from an animal during a class at the Joint Pathology Center in Silver Spring, Md., Feb. 22, 2019. Veterinary pathology specializes in the diagnosis of diseases through the examination of animal tissue and body fluids. DOD photo by Army Staff Sgt. Vanessa Atchley