http://www.dod.mil/pubs/foi/Reading_Room/Other/
Most of these are anthropology reports commissioned by the DoD. A lot of them are super interesting. Examples:
2st Century Cultures of War http://www.dod.mil/pubs/foi/Reading_Room/Other/Litigation%20...
Axis of Troubles: Male Youth and Factional Politics http://www.dod.mil/pubs/foi/Reading_Room/Other/Litigation%20...
The Future of Europe http://www.dod.mil/pubs/foi/Reading_Room/Other/Litigation%20...
The Future of Africa and the Future of China in Africa http://www.dod.mil/pubs/foi/Reading_Room/Other/Litigation%20...