content: What is causing the F-18, F-22, and F-35 hypoxia issues? Story about the F-18 that mentions the F-22: https://theaviationist.com/2017/03/29/all-u-s-fa-18-hornet-models-affected-by-oxygen-deprivation-and-cabin-decompression-issues/  Another about the F-35: http://www.military.com/daily-news/2017/06/15/f35a-hypoxia-problems-date-back-2011-air-force-reveals.html