Parameters is a quarterly publication containing many articles of interest concerning US strategy and land power. It's just recently become available in PDF form on the Strategic Studies Institute of the Army War College web site. All issues going back to 1971 are available, and is a valuable resource for historians and others.
http://www.strategicstudiesinstitute.ar ... arameters/
http://www.strategicstudiesinstitute.ar ... arameters/