Hopi was an air-to-surface missile developed by the United States Navy's Naval Ordnance Test Station.
Untangling the Web - A Guide to Internet Research NSA Publication
Manual of Investigative Operations and Guidelines (MIOG)
The following documents are archived at The Black Vault to offer researchers useful guides to publications, documents, articles, and government agencies/structures.
FBI Domestic Investigations and Operations Guide (DIOG)
Weapons Classification Guide