Col. Julie Stola, 45th Medical Group commander, presents Lt. Col. Donna Fox, 45th Medical Operations Squadron commander, with the guidon during a change of command ceremony June 24, 2016, at Patrick Air Force Base, Fla. Changes of command are a military tradition representing the transfer of responsibilities from the presiding official to the upcoming official. (U.S. Air Force photo/Matthew S. Jurgens/Released)