I recently finished the autobiography of Calvin Coolidge. It was a recommend and I liked it. Your local library probably has a copy. Mine did not so I checked it out from archive.org.
I also read (for not the first time) “A Lonely Kind of War”, by Harrison. It’s a highly regarded first person narrative about the experiences of a forward air controller in Vietnam Nam that flew the OV-10. It’s filled with action from the first paragraph.
If you like Vietnam Nam stories, check out “The 13th Valley” by Del Vechio, “A work that has served as a literary cornerstone for the Vietnam generation”. It is said to a most realistic portrayal. Check the many reviews. I’ve read it several times over the years.
Currently, it’s “Arguing with Zombies” by Paul Krugman (Keynesian economist). It’s a collection of some of his writings in the NYT. I’d say unless you are interested in economics and the politics thereof, you might let this one go.
You can’t go wrong with “The Killer Angels” by Shaara. Historical fiction about the battle of Gettysburg. It was awarded the Pulitzer Prize for fiction in 1975.