Normally, Presidents get 4 cannons with 3 seconds between cannon shots. This is what President Trump received. He even got this 21-Gun Salute at Andrews Air Force Base before flying to Mar-a-Lago aboard Air Force 1.
What Biden got was a three-gun 21-gun salute at Arlington National Cemetery. That’s the salute used when laying a wreath at the Tomb of the Unknown Soldier. It’s easy to spot the difference in the intervals between shots for the two different types of salutes.
Our military knows that Biden is an illegitimate President. They will act when the time is right.