LT found it interesting that they may have considered Biden a foreign dignitary. I’d have to find that episode.
*****
I found it.
at 19:15 mark
"The 21-gun salute is not to be confused with the three-volley salute (or three-rifle volley) rendered at military honors funerals, which you might see or hear at Arlington National Cemetery."
No better source than Arlington National Cemetery itself!