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Emory Upton was a 19th Century US Army officer who was very influential in the area of Army tactics - he has been called the US Army's equivilent of Mahan.
In OTL, he died in 1881 at the age of 42 of suicide - he suffered from tremendous headaches perhaps caused by a brain tumor.
OK - easy POD - we do away his headaches. He lives until 1920 - which would make him old (81) but not ancient. How does he continue to influence the development of the US Army?