 General Lewis has served at Headquarters Air Force Materiel Command as Chief of Programs and Evaluations in the Office of the Command Surgeon, and at Headquarters U.S. Air Force as Chief of Personnel, Training and Medical Programs.She has also served as executive officer to the Air Force Surgeon General and Director of Medical Operations for Headquarters Air Force Inspection Agency.Her commands include the 1st Medical Support Squadron at Langley AFB, Virginia, and 366th Medical Group at Mountain Home AFB, Idaho.