https://archive.org/details/1939RadioNews
news reports
https://www.invests.com/2018/12/17/darpa-given-job-of-creating-mini-darpa-for-u-s-space-force/
DARPA Given Job of Creating “Mini-DARPA” For U.S. Space Force
https://spacenews.com/u-s-air-force-releasing-more-data-on-orbits-of-military-satellites/
U.S. Air Force releasing more data on orbits of military satellites