Have you interviewed the troops and confirmed they all did it as an act of disrespect?
If your declassified files are as reliable as the statement I've quoted then you should bin it all now.
The National Guard were there to guard Biden, not to look at him.
Some were facing the road, some were facing away,, to watch for any trouble behind.
It's standard military practice, have you never heard the term "Watch my Back"?
The declassified material does not reflect on the troops and the inauguration, Trump had kind of left by then, now so hard is info to find on this matter that even I have to speculate, why 25,000 troops and 1000's of local law enforcements and secret service?
From what I can gather that amount of troops was not requested in such numbers but more so stationed by the pentagon and given it's military instructions and movements it is impossible to get any info on it especially relating to this event and how recent it was.
Given that in 2009 Obama sent 30,000 more troops in Afghanistan due to the threat level of a post war zone you really have to ask why 25,000 in domestic virtual event?
It is totally unrealistic that the dem's would request such a large amount, 5,000 is more than enough for a virtual inauguration, it was very difficult to get in and out of DC by all accounts on the day so how we justify 25,000 is just mind boggling and even the media on both sides were confused.
I speculate something was planned or expected to go down on that day and it didn't for some reason, now either a high level threat we haven't been privy to was incoming and numbers on the ground made the threat (if a large group of activists) change their minds or ... the military were actually planning something themselves but they changed their minds for some unknown reason... it could even be something else but what I don't buy is there were just there in such numbers for nothing more than show of force.
PS the video of the guards turning their back is disputed with one side saying one thing and the other saying another thing, what does not make sense is why does the car drive past single filed soldiers for a good distance all facing the car and not scoping the rear like you suggest would be normal then we get to a group all facing away and about 4 lines deep, surely only the rear guard would be looking out the other way and not all 4 tiers if your suggestion was right.
The national guards comments are at most protecting their own arses for their guards disrespectful nature. If this was normal to secure the perimeter then we would have seen it throughout the line of soldiers earlier in the drive past but that was simply not the case at all.