Hi, DooWop...
Raytheon is also one of several co-developers of the High Assurance Platform. They have, I believe, focused a little more on the embedded side of things.
One of Raytheon's researchers, a Mr. Rushby, is considered the father of the MILS (Multiple Independent Layers of Security) architecture. Had MILS not emerged, there would be no HAP as we know it today.
Best Regards,
c m