Airman 1st Class Kristen Lowder, a medical laboratory technician assigned to the 28th Medical Support Squadron, takes a blood sample from Airman 1st Class Von Black, a food services apprentice assigned to the 28th Force Support Squadron, inside the medical laboratory at Ellsworth Air Force Base, S.D., April 24, 2017. Lowder is the project officer for the 28th Medical Group bone marrow donation week. (U.S. Air Force photo by Airman Nicolas Z. Erwin)