I think that a lot of lessons are learned and carried forward, but it is a cult of personality thing. For example, Sir Garnet Wlsey had his ring, which was able to apply lessons learneduntil its members died, passed out of service, or passed out of favor (as happened to Redvers Buller in that second--or maybe third if you count the Zulu War--"small war" in South Africa). The US Army has had its "rings" as well. I'm sure we could all recount and reminsice about those "rings" at our leisure. The point is that I think Armies (and hierarchical organizations in general) tend to apply only those things that the current leadership values. The German Army learned what to avoid from WWI in the interwar years, but, after France 1940, I submit quickly "forgot" those important lessons when the Fuhrer through the OKW marginalized von Brauchitsch and the OKH to put his personal leadership stamp on the conduct of the ground war.
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