.mil is a domain used for military websites and covers all the military-related publications and research papers. We can use this in our search strategy by limiting with the site-specific search i.e. site:*.*.mil
For example, you want to search for expendable decoys, search in this way: – expendable decoys site:*.*.mil
and DTIC (http://www.dtic.mil) is a database that covers all the military-related research papers and publication, try to also make use of this database.
Manager, Patent Search Team – GreyB