https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/color-blindness/types-color-vision-deficiency
https://time.com/archive/6769967/national-defense-color-blind-observers/
https://www.reddit.com/r/AskHistorians/comments/a32spn/colorblind_recruited_in_ww2_to_see_camouflage/
https://www.bbc.co.uk/history/ww2peopleswar/stories/99/a2107199.shtml
https://academic.oup.com/milmed/article-abstract/175/2/84/4344546?redirectedFrom=PDF
https://www.militarytimes.com/off-duty/military-culture/2023/06/05/do-you-need-color-vision-to-be-a-pilot-in-the-military/
https://www.aao.org/eye-health/diseases/what-is-color-blindness
https://pubmed.ncbi.nlm.nih.gov/1104986/#:~:text=Holmgren's%20supposition%20that%20colour%20blindness,basis%20of%20the%20court%20records.
https://pubmed.ncbi.nlm.nih.gov/22301271/
https://en.wikipedia.org/wiki/Lagerlunda_rail_accident