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If he was already sworn in when the OPs picture was taken then it is fine although not required if the Commander in Chief salutes any subordinate that salutes him - this was confirmed by Reagan while he was president and started doing it occasionally...as have other presidents especially in a ceremonial situation.
As far as all other civilians - anyone with a grade school education knows that you salute a passing flag or paying respect during the national anthem by placing your hand over your heart - and if you are a male... wearing a hat...removing it ...and of course everyone standing
Just standard American Civics 101
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