"When 2 or more persons entitled to honors
arrive at or depart from an installation at the same time, only the senior will
receive honors.
Any official or officer holding 2 or more
positions (civil or military), 1 of which entitles him or her to honors, will
receive only the honors due the highest grade. In no event will the same person
be honored in more than 1 capacity."
I only saw 2 cannons that were being fired at the cemetery.
"When 2 or more persons entitled to honors arrive at or depart from an installation at the same time, only the senior will receive honors.
Any official or officer holding 2 or more positions (civil or military), 1 of which entitles him or her to honors, will receive only the honors due the highest grade. In no event will the same person be honored in more than 1 capacity."
I only saw 2 cannons that were being fired at the cemetery.
Yep. The same day, POTUS Trump received a proper 21 gun salute (3 cannon, 21 rounds, 3 second spacing) after leaving marine one prior to his speech.