The Washington Post weighs-in this morning with "The Afghanistan Papers," a broad look at the war in Afghanistan.
https://www.washingtonpost.com/graphics/2019/investigations/afghanistan-papers/afghanistan-war-confidential-documents/
The article also contains links to all the source documents (interviews, memos, etc). Quite the rabbit hole to go down. This interview with BGen Brian Copes, Indiana Army Guard, was just three pages, but hit on a lot of the major topics (too much money, too much in-fighting between DoD, DoS, etc, too much "top-down" thinking, etc).
https://www.washingtonpost.com/graphics/2019/investigations/afghanistan-papers/documents-database/?document=copes_brian_ll_05_c15_02252016