Command Sgt. Major John Wayne Troxell, senior enlisted advisor to the Chairman of the Joint Chiefs of Staff and the senior non-commissioned officer in the U.S. Armed Forces, observes as Staff Sgt. Jemima Alvarez, an instructor in the Biomedical Equipment Technician program, demonstrates a virtual interactive classroom modality that the program is testing as a training tool for repairing Expeditionary Deployable Oxygen Concentration System units while BMET instructor Master Sgt. Christian Bond explains how it works.