<PERSON>, a 28th Medical Support Squadron medical laboratory technologist, sorts vials of blood and plasma for shipping at the 28th Medical Group laboratory on Ellsworth Air Force Base, S.D., Dec. 4, 2018. Depending on a person's diet or health, human plasma can range in color and opacity from neon yellow to cloudy red. (U.S. Air Force photo by <PERSON>. <PERSON>)