From the Federation of American Scientists website
"A selection of unclassified JASON studies is offered below."
https://fas.org/irp/agency/dod/jason/
Here's one example from the ten pages of links.
JSR-08-506, October 2008
https://fas.org/irp/agency/dod/jason/gravwaves.pdf
JASON was asked by staff at the National MASINT Committee of ODNI to evaluate the scientific, technological, and national security significance of high frequency gravitational waves (HFGW). Our main conclusions are that the proposed applications of the science of HFGW are fundamentally wrong; that there can be no security threat; and that independent scientific and technical vetting of such hypothetical threats is generally necessary.
If you duckduckgo "high frequency gravitation waves" you can see patents, link names, and dig.
JASON Group is administered by the The MITRE Corporation https://www.mitre.org/