412th MDOS welcomes new commander Published July 24, 2013 By 412th Test Wing Public Affairs EDWARDS AIR FORCE BASE, Calif. -- Col. Stephen Donaldson (left), 412th Medical Group commander, presided over a change of command ceremony in which Lt. Col. Corey Munro succeeded Lt. Col. Tracy A. Neal-Walden as the 412th Medical Operations Squadron commander July 22, 2013 at Club Muroc. Munro was previously assigned as the commander of 673rd Medical Group - Pharmacy Flight at Joint Base Elmendorf-Richardson, Alaska.