From Secrecy News (FAS Blog) - Army Seeks to Catalyze Open Source Intelligence.

A new U.S. Army Field Manual is intended to advance the development and use of open source intelligence (OSINT), which is intelligence that is derived from publicly available data legally obtained.

"The value of publicly available information as a source of intelligence has... often been overlooked in Army intelligence operations. This manual (pdf) provides a catalyst for renewing the Army's awareness of the value of open sources; establishing a common understanding of OSINT; and developing systematic approaches to collection, processing, and analysis of publicly available information."

The growing military appreciation of open source intelligence arises from the ever-increasing quality of public sources and the evident limitations of traditional classified approaches...