Amazon.com: Black Hearts: One Platoon's Descent into Madness in Iraq's Triangle of Death...

https://www.amazon.com/Black-Hearts-Platoons-Descent-Triangle/dp/ [login to see]
If you haven't had a chance to read this book, I would put it on your list. It's a real life example of how toxic leadership from the top down can have compounding negative effects, that, in this case, resulted in sexual assault, murder, and jail time. I won't spoil any more of the book, but it's an excellent read for those looking for professional development.