A bunch of good ones for M…
The Meditations of Marcus Aurelius. The private journal of the 2nd Century Roman Emperor, written while campaigning. Musings on philosophy and stoicism and what it means to be a good man or a rational man. I frequently pick up Meditations and read a few random passages; I finally got a Kindle edition I could read on my phone because I wore out my paper copy, and now it's my favorite "I've got 5 minutes to kill" reading.
Mao Tse Tung on Guerilla Warfare. Still the seminal work on the topic as far as I’m concerned, a highly practical book written while Mao was actively fighting a guerilla war against the Nationalists.
Mind Hunter by John Douglas. Douglas is the guy who founded the FBI behavioral science “profiler” unit, and served as the basis for Scott Glen’s character in Silence of the Lambs. More recent research has cast serious doubt on the effectiveness of his type of profiling, but it’s still a fascinating read, tho a teensy bit dark.
The Milagro Beanfield War by John Nichols. A wonderful novel about a struggle for water rights in a fictional New Mexico town. Mandatory reading if you’re from NM – if you’re not, you may not get it, but that’s not my problem.
Merchants of Doubt by Naomi Oreskes & Erik Conway. Connects the dost showing how the group of scientists and advisors that are claiming climate change is fake are the same people – literally the exact same people in many cases – who in previous decades used the exact same tactics to create public doubt that smoking causes lung cancer, coal smoke causes acid rain, and CFC harm the ozone layer.
The Martian Chronicles by Ray Bradbury. Some of his best work IMO.
Men Against Fire: the Problem of Battle Command in Future War by SLA Marshall. Published right after WWII, and based on interviews & research he conducted during that war, Marshall made the claim that only 25% of US soldiers actually fired their weapon with intent to kill even when they were under direct enemy fire. Hugely controversial to this day, and a number of people have seriously questioned his research methodology, so read with a grain of salt; but still well worth reading.