In this article via Task & Purpose, author Brad Hardy states that operational art is a cornerstone doctrinal concept that joint headquarters and defence forces use to plan everything from battalion-sized operations through to major campaigns. As such, he argues that its definition is so broad that it is vulnerable to losing its meaning.

This article by Lieutenant General H.R. McMaster via Modern War Institute focuses on the study of war and warfare. McMaster is a strong advocate for professional military education and the study of the profession of arms.

In this monograph 'Strategy and Grand Strategy: What Students and Practitioners Need to Know', via the U.S. Army War College Strategic Studies Institute, Dr. Tami Davis Biddle examines why it is so difficult to devise, implement, and sustain sound strategies and grand strategies.

'Strategic Theory for the 21st Century: The Little Book on Big Strategy' is an excellent resource written by Harry Yarger and published by the U.S. War College. As this is an 83 page document, the Cove has provided a summary of the most important points.