TYNDALL AIR FORCE BASE, Fla. --   Col. David Graff, 325th Fighter Wing commander, passed command of the 325th Medical Group to Col. Frederick Weaver during a change of command ceremony June 25. Colonel Weaver replaces Col. Paul Skala, who departs Tyndall to be the Command Administrator and Director of Medical Support at U.S. Air Forces in Europe. Colonel Weaver was previously the Special Assistant to the Air Force Surgeon General for Military Health System Governance.