The image is a screenshot of a search result snippet from the VA.gov website regarding the protocol for flying the American flag at half-staff. It states: "The flag should fly at half-staff for 30 days at all federal buildings, grounds, and naval vessels throughout the United States and its territories and possessions after the death of the president or a former president." The source is identified as VA.gov Home | Veterans Affairs, with a link to a PDF titled "Flying the American Flag at Half Staff."
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