At about 19:30UTC 12/5/18, I heard them on Potomac Departure. I used the feed that captured a bunch of sectors - with that many feeds there was a lot of cross talk. I may go back and try some of the other sectors on the archive. They identified as "Sam 41." I heard them several times as they moved through the airspace.
Another pilot that I couldn't identify must have been referring to seeing it in the air because he said, "That's one of the coolest things I've ever seen." Indeed, watching SAM29000 taking off on TV with the late president was a somber but magnificent sight, made me proud to be an American!