U.S. Air Force Dr. (Maj.) Arthur Greenwood, 633rd Medical Operation Squadron staff obstetrician-gynecologist, washes his hands prior to surgery at Langley Air Force Base, Va., Nov. 8, 2013. Greenwood works in the Women’s Health clinic and specializes in single-incision laparoscopic hysterectomies. (U.S. Air Force photo by Staff Sgt. Stephanie R. Plichta/Released)