War in History http://wih.sagepub.com is the most important journal dealing with strategic studies that also carries an historical dimension.

Journal of Strategic Studies http://www.tandfonline.com/toc/fjss20/current is a valuable reference in strategic studies.

Small Wars and Insurgencies http://www.tandfonline.com/toc/fswi20/current concentrates especially on insurgencies and counterinsurgency; one will find the main debates here.

RUSI Journal https://www.rusi.org/publications/journal is published by the Royal United Services Institute, and gives current debates on the theory and practice of strategy. For the US Army see the Military Review https://www.armyupress.army.mil/Military-Review/ and for the US interservice debate, see Joint Force Quarterly http://ndupress.ndu.edu/JFQ/ published by the US National Defense University.

British Journal for Military History http://bjmh.org.uk/index.php/bjmh is a fairly new and ambitious journal devoting a section to the practice of strategy.