It was the F-15 Eagle. As the F-22 is replacing the F-15 as the next gen air superiority fighter. The Air Force wanted to see how effective the Raptor can be against its predecessor. You're right on the 2nd part. The F-22 virtually shot down all F-15's without the pilots even knowing where it was. The F-35 in the Navy variant will be replacing the now retired( as of February) F-14 Tomcat( RIP). In the Marine variant, the Harrier, and in the Air Force variant the F-16. I hope the F-35 is put against its predecessors as was the F-22 was. That would mean a F-14 equipped with the Phoenix long range missile. So if the F-35's stealth capabilities work, the F-14 won't be able to see it before it is too late.
Northrop Grumman knows how to make planes as much as Lockheed does. Many say part of the reason why the Lockheed F-22 was chosen over the YF-23 was because Lockheed promised to employ more then Northrop was saying. But, both planes were awesome and my bias towards Northrop Grumman says the YF-23 should of been chosen over the Raptor.

The B-2 is marvel of technology. Northrop hit the nail on the head with this bomber. The wing design was impossible back in the Post-WWII era when a similar looking bomber to the B-2 was developed by Grumman as the wing design posed many dangers. An example of this is that if the plane stalled, the bomber would go into a unrecoverable spin. Which led to the planes cancellation. What makes the wing design possible now is that the B-2 has ton of computers that will not allow the pilot to bring the B-2 to a stall situation.