Patti James, a 28th Medical Support Squadron medical laboratory technologist, counts white blood cells at the 28th Medical Group laboratory on Ellsworth Air Force Base, S.D., Dec. 4, 2018. There are five major types of white blood cells medical technicians look for, they include neutrophils, lymphocytes, eosinophils, monocytes and basophils. (U.S. Air Force photo by Airman 1st Class Nicolas Z. Erwin)