Probably a DRAGO-51 flyover....
Neat vid of the E-4B arriving UK after AF-1 about 7 minutes in.. UK fans there had a field day for the arrivals.
That E-4 so tall they put flashing red light up on top AIRFORCE ONE - YouTube
0911- Drago 51 (B-52 H # 60-0058) working Potomac (348.725) request to hold over the Nottingham VOR w/10 mile legs to prepare for fly over.
Drago 51 also working secondary Potomac freq (270.275). After fly over requesting routing to Martinsburg (KMRB). Advises their final destination is KBAD (Barksdale). Looking for fly over at 0955 local (1955Z). They are at 2,100 ft, must be a cool sight over DC.
0925- Two WRI KC-10s Inmar 13 (# 83-0083) & Team 51 ((#79-1711) heading towards AR218 working on discrete (268.025). Inmar 13 advises they have two inexperienced pilots who want to practice hook ups and break aways. Also working on discrete (378.85).
0944- Looks like tankers on 378.85 are another pair of McGuire KC-10s (# 87-0121 & # 79-1712) also heading out towards AR-217/218
Looking on ADS-B it looks like Drago 51 hit right over Arlington Cemetery at 0955 local. Nice job. Climbing to FL150 after fly over--working Potomac (257.2). Interesting that they didn't use standard fly over freqs (124.0 or 279.275). On way back to BAD, working ZDC Montebello (284.7). Is cleared to BKW VOR for AR in 455West. Working ZDC Casanova (282.2) advising they are heading to Beckley radial then onto AR455 west.
1335- Score 12 (E-2D # 168076 AE2FD6) working Giantkiller (118.125) out in Atlantic Test Track.
1344- ADS-B showing Otis 51 flt (3 X KC-130Js VMGR-252, MCAS Cherry Point, NC) crossing lower Chesapeake Bay heading north up the coast. Working ZDC Cape Charles (132.55) & ZDC sea Isle (133.125). Heading across the pond?