Recently it has been in the news that Biden's inauguration could feature more than 2,500, more than 5,000, more than 10,000, 20,000, 25,000, or even 30,000 national guardsmen in DC.
It's hard to contextualize these numbers because I'm not sure what is normal.
How many soldiers were present in DC for past inaugurations?
I am mainly interested in the more recent presidents (say, back to Clinton) as I think they will be most relevant in the comparison. I am also interested if there is any specific reason why a president has more or less than usual.