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Incorrect ... She is not in a position of Command, and won't be unless she becomes President.
Soldiers are not required to salute the Vice President.
They can salute her as a gesture of respect, but it is not required.
When President Biden was reminded to salute the troops, it was a reminder to return the salute the soldiers are required to give.
The President is technically not saluting them.
The return salute is not required from the President, although they often do because it allows the soldier to return to their duties.
If the President doesn't return the salute, the solider will remain "At Attention" and saluting until the Commander in Chief has passed a certain distance.
Should the President be thoughtless, fail to return the salute, or acknowledge the solider, and have a conversation with someone else standing in front of the soldier,
they will remain "At Attention" and saluting until another Senior Commanding Officer comes along
and gives the Verbal Command of "At Ease" or "As You Were".
The President can also use the same Verbal Commands to allow the soldier to return to their duties, without saluting.
The President could also do something as simple as nod in the direction of the soldier,
and then the soldier would then be at their own discretion as to whether or not that allowed them to return to their duties.
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