191001-F-F3456-1006.JPG
National Commission on Military Aviation Safety commissioner Gen. Raymond E. Johns, (USAF, Ret.) looks over testing equipment at the 711th Human Performance Wing’s On-board Oxygen Generation Systems (OBOGS) Laboratory Sept. 11, 2019 during the commission’s visit to Wright-Patterson Air Force Base. (National Commission on Military Aviation Safety photo/Bryan Whitman)