In the first segment starting around 2:30 my best guess is that this is the RQ-180 drone that they just moved out for testing. I live in the High Desert in California and I've seen this thing. The RQ-180 is produced by Northrop Grumman and has a 130 foot wingspan. The only things that pop up on image search in Google are artists' conceptions, so I cannot positively identify the aircraft, but that is the exact one I have seen. One did a low flyby of my house and it definitely has a jet powered engine. Maybe he couldn't hear it because it was flying high. At night the light in the center flashes red and it has 3 white lights on the front. The red flashers make the insides of the wings visible at night and it looks totally awesome.