Hyperbaric oxygen therapy has been shown to effectively treat traumatic brain injury, chronic traumatic encephalopathy, and post-traumatic stress disorder. However, it has faced resistance to being adopted as a treatment. The document discusses the history and mechanisms of hyperbaric oxygen therapy. It argues that timely use of hyperbaric oxygen therapy could help reduce the high suicide rate of military veterans with brain injuries. However, adoption of the treatment has faced interference from those who want to protect the status quo or avoid costs and liability issues. Clinical trials have shown hyperbaric oxygen therapy can significantly improve outcomes for conditions like brain injury but it continues to be ignored as a treatment option.