Archives.org provides free US military manuals, including army technical manuals, field manuals and weapons manuals. The manuals are taken from the United States Army's Army Publishing Directorate.
To find free army technical manuals on Archives.org, go to the homepage, type in "US Military Manual Collections" inside the search toolbox under Internet Archive, and click Go. Click the first search result to access the manual collections. The collection includes manuals, such as map reading and land navigation, battle focused training, rappelling and carpentry and first aid for soldiers. The manuals can be viewed online or be downloaded in a number of formats.