I really liked "Small Unit Leadership" as having some good lessons for business leaders as well.

One thing that stuck with me is how the military can't just fire the people that don't work out, so there's significant time spent on how to get underperforming people / units back into shape.

https://www.amazon.com/Small-Unit-Leadership-Commonsense-App...

Here's the list of books I've been recommending new managers and leaders read:

Small Unit Leadership: A Commonsense Approach https://www.amazon.com/Small-Unit-Leadership-Commonsense-App...

The Five Dysfunctions of a Team: A Leadership Fable https://www.amazon.com/dp/0787960756/?coliid=I12MQNI6MIK6JR&...

High Output Management https://www.amazon.com/dp/0679762884/?coliid=I2G1Y1JLPP55SY&...

Measure What Matters https://www.amazon.com/dp/0525536221/?coliid=I1G6EQRC0QYPE1&...

Death by Meeting https://www.amazon.com/dp/0787968056/?coliid=I38A8AYMZGSLYZ&...

Work Rules!: Insights from Inside Google That Will Transform How You Live and Lead https://www.amazon.com/gp/product/1455554790/ref=ppx_yo_dt_b...

The Hard Thing About Hard Things https://www.amazon.com/Hard-Thing-About-Things-Building/dp/B...

Start with Why (you can prob skip the book and just watch https://www.ted.com/talks/simon_sinek_how_great_leaders_insp...) https://www.amazon.com/dp/1591846447/?coliid=I2Q0IN84LJ230W&...

I would also strongly recommend "Small Unit Leadership: A Commonsense Approach": https://www.amazon.com/Small-Unit-Leadership-Commonsense-App...