Medical Command''s Command Sgt. Maj. Althea Dixon pins Sgt. Maj. Billy Cheatum from U.S. Army Medical Department Center and School, Sgt. Maj. William Majors from U.S. Army Medical Materiel Center-Europe and Sgt. Maj. Horace Tyson from the U.S. Army Medical Research and Materiel Command during this year?s Association of the United States Army conference.