Military science refers to the discipline dealing with the principles of warfare.
Regular Websites
Specializing in downloadable military manuals, electronic books, CDs and other military resources, on such topics as army decontamination and procedures, war history, weapons manuals, and special operations. - eMilitary Manuals
http://www.emilitarymanuals.com/
Institute for Defense Analyses
The IDA is a non-profit corporation that administers federally funded research and development centers for the purpose of providing objective analyses of national security issues, especially those requiring scientific and technical expertise, as well as conducting research into other national defense challenges. - Institute for Defense Analyses
http://www.ida.org/
United States Army Combined Arms Center
Based in Fort Leavenworth, the oldest active military operation west of the Mississippi River, CAC is the major subordinate headquarters of the U.S. Army Training and Doctrine Command, responsible for preparing the Army and its leaders for war. The Command and General Staff College is described, including its schools and centers, as well as the Combined Arms Research Library, which is a military science research center serving as the post library for the Fort Leavenworth community. - United States Army Combined Arms Center
http://usacac.army.mil/