Assuming date of video is correct - today 09 Mar 2021 - the motorcade: https://youtu.be/fy-jpV6D7cE
Direction motorcade was traveling at POV of source - the arrow indicates both area of POV and direction of travel: https://files.catbox.moe/lg8a1m.GIF
Xiden motorcade looked to be heading out of the city. Certainly the wrong direction in relation of White House to WS Jenks Hardware in NE - where Xiden traveled to today: https://files.catbox.moe/ptg6ii.GIF
The HMX helos I have no idea where they were coming from. Looked to be from VA side, not JBAB.
It's not a base. It's the marine barracks and 8th and I. The drum & bugle corps, drill team and various other marine detachments are stationed there. Closest actual marine base is Quantico, Va. Just a bit south.
Nice, thanks for the info. I’m from southern Maryland and life in northern VA now. I never knew the marines were in DC at all.
Good friend of mine served there for 23 years in the band. All ceremonial.