Compare this to the 21-gun salute for Obama at Arlington for the 2013 National Memorial Day:

https://youtu.be/57kN-uWzPug?t=222

4 artillery pieces, 3-second intervals on a ridge overlooking the cemetery. Army regulations may specify that a 3-second interval is not safe for a battery of 3 artillery guns, but there is no way that the military would not have the freedom to choose a good spot to set up a battery of 4.

Edit: They are also most definitely capable of 5-second intervals for a battery of 3 artillery guns:

https://youtu.be/O9TEdwYu36M?t=51

I compiled a quick list of other videos to compare to here:

https://greatawakening.win/p/11SK2cglAz/the-21gun-salute-applestoapples-/c/

Compare this to the 21-gun salute for Obama at Arlington for the 2013 National Memorial Day:

https://www.youtube.com/watch?v=57kN-uWzPug

4 artillery pieces, 3-second intervals on a ridge overlooking the cemetery. Army regulations may specify that a 3-second interval is not safe for a battery of 3 artillery guns, but there is no way that the military would not have the freedom to choose a good spot to set up a battery of 4.