Re: Marching Band and units...
It looked to me like a multi-service marching unit consisting of roughly platoon-sized elements from each of the Armed Forces (except one) - starting with the Army (visible at 00:14), the the Marines, Color Guard (US Flag, Presidents Flag, VP Flag), Navy, Air Force and Coast Guard, Revolutionary War Unit, Revolutionary War Band. Space Force did not seem to be represented.
They all stopped (about 1:30), came to Order Arms (by platoon) and did a facing movement to the left (as a unit at about 2:50). Then it looks like the NCOIC and the OIC (Non-Commissioned Officer in Charge and Officer in Charge) moved to their respective places in the “front” (towards the building), and “rear” (where the cameraman is).
“Present Arms” is called at 3:58 and is held until 4:20. (Saluting the 1776 building.) The command “Order Arms” is given, and all salutes are dropped and everyone returns to the position of “Attention”.
The Color Guard then is shown filing to the “rear” and up the street on the sidewalk at about 4:50, NCOICs move out and then 2 Air Force, 1 Navy, 1 Air Force and and Army SGT with a kahki/green tackle box walk by the camera.
Units are then individually ordered to “About Face” (turn around) and “Port Arms” (carry weapon diagonally). They are then told to file by squad (march in a line) and follow the Color Guard.
Maybe the road was blocked ahead and the had to go around it on the sidewalk. It seemed kinda odd.
I noticed at 7:20 that the Revolutionary War troops all dismounted their bayonets when they walked past the cameraman. (Sounded like someone dropped one at 7:38)
I know that the Army has a marching band that dresses in Revolutionary War uniforms (Old Guard Fife and Drum Corps -https://en.wikipedia.org/wiki/Old_Guard_Fife_and_Drum_Corps). I don’t know if these are them, I would think that they would move with a bit more “snap” at the very end of the video.
The guy carrying the “Nickelback Fan Club” - Hahahahaha!
(just my 2 cents worth of observations....)
Video purported to be a rehearsal from a few days before...
https://www.youtube.com/watch?v=w8Ph8ysFXjY
Seems to make more sense, the units are saluting the Colors (note the officers with the swords/sabers at about 4:55).
Did you see the tiny little bugles some of them were carrying? Didn’t hear them played only the drums but some of them were definitely carrying bugles.