Martin van Creveld writes some serious analysis. Consider... Supplying War -- on logistics (as in "professionals study...") Command in War -- on communication, information, and the importance of local autonomy leading to quick action The Transformation of War -- has strategy's biggest buzzword right there in the title, but this was written back in 1991. On the growing role of low-intensity and asymmetric conflicts. His books tend to be short, but very dense.
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