Department of Defense - portal that provides official, timely and accurate information about defense policies, organizations, functions and operations and for finding military information on-line.
Scientific & Technical Information Network - unclassified, pertinent scientific and technical information since 1974
Center for Defense Information - articles, position papers, etc.
'Westpoint in the Making of America, 1802-1918' -the history of the U.S. Military Academy at West Point, its contributions to American history, & accomplishments of selected West Point graduates; West Point became an important American institution before the Civil War.
Minuteman Missile National Historic Site: Protecting a Legacy of the Cold War - tells the story of one of the most significant strategic weapons in U.S. history: the Minuteman ICBM (Intercontinental Ballistic Missile). By 1965 there were 1,000 Minuteman ICBMs hidden across the Great Plains in six missile fields, transforming the prairie into a military-technological frontier and providing a key component in the U.S. Cold War policy of deterrence.
Naval Historical Center - search for full-text administrative histories and reports and other publications, there is an FOIA Reading Room with info on Amelia Earhart, the Bermuda Triangle, and the attack on Pearl Harbor