I read from your intro that you are learning to apply Sun Tzu and Liddell Hart to the business world, so you might be interested in Paul Howe's Training and Leadership for the Fight.

Although he writes from the perspective of being a former member of Delta and now a tactical firearms trainer, he beats the drums nicely and I think his tone will resonate well for you.

Also, anything Kilcullen makes for good reads.

But if you don't have much time, I'd recommend reading the past issues of the Small Wars Journal. If you have not dipped a toe into the waters there, the articles tend to make for easy reading just before turning out the bedside table lamp.