I really enjoy Jocko Willink podcasts. He has a couple books out which were fun to read. He's a gnarly military guy but I appreciate his extreme dedication to discipline, I find it inspiring.
Basically, in the first (roughly) 30 episodes, he covers war related books and provides commentary. The content he covers is, at times, totally fucking brutal (i.e., 800,000+ people murdered in Rwanda by machetes). It is tragic to hear, but beneficial I believe in knowing what humanity is capable of.