Capt. Megan McDonald, a pediatrician with the 28th Medical Group, performs a check-up on a child at Ellsworth Air Force Base, S.D., Sept. 8, 2016. McDonald graduated from the U.S. Air Force Academy in 2008, and attended medical school at Georgetown University School of Medicine. She later attended pediatric residency training at Dayton Children's Hospital at Wright Patterson Air Force Base, Ohio, the nation's only fully integrated military-civilian residency training program. (U.S. Air Force photo by Airman 1st Class Donald C. Knechtel)