U.S. Army Field Manuals are published by the United States Army's Army Publishing Directorate. As of 27 July 2007, some 542 field manuals were in use. They contain detailed information and how-tos for procedures important to soldiers serving in the field. They are usually available to the public at low cost or free electronically. Many websites have begun collecting PDF versions of Army Field Manuals, Technical Manuals and Weapon Manuals.
Lately, most of the US Field Manuals have been submitted to the public domain. This has given civilians the possibility of learning from them. Especially for people training survival skills (e.g., survivalists, adventurous travelers and tourists, poor people, e.g., subsistence farmers in the third world, the US Field Manuals are providing a valuable resource. The presence of the document in the public domain has also allowed terrorists to use the manual for training purposes.