In the dc area there are very frequent military helicopter flyovers, nothing unusual. There are several military bases along with a helicopter airfield.
Yes I have, quantico marine Corp base is nearby along with an army airfield, and multiple military bases. I even see marine one fly sometimes.
The cia also has a heliport, right at their HQ. nothing unusual about seeing just about any type of military aircraft in the dc area. I have seen full sized military drones as well.
https://www.airnav.com/airport/84VA