United States Code
Title 36: Chapter 10: Patriotic Customs

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Section 171: Conduct during playing of the National Anthem
During rendition of the national anthem when the flag is displayed, all present except those in uniform should stand at attention facing the flag with the right hand over the heart. Men not in uniform should remove their headdress with their right hand and hold it at the left shoulder, the hand being over the heart. Persons in uniform should render the military salute at the first note of the anthem and retain this position until the last note. When the flag is not displayed, those present should face toward the music and act in the same manner they would if the flag were displayed there.

Section 172: Pledge of allegiance to the flag; manner of delivery
The Pledge of Allegiance to the Flag, should be rendered by standing at attention facing the flag with the right hand over the heart. When not in uniform men should remove their headdress with their right hand and hold it at the left shoulder, the hand being over the heart. Persons in uniform should remain silent, face the flag, and render the military salute.

Section 177: Conduct during hoisting, lowering or passing of flag
During the ceremony of hoisting or lowering the flag or when the flag is passing in a parade or in review, all persons present except those in uniform should face the flag and stand at attention with the right hand over the heart. Those present in uniform should render the military salute. When not in uniform, men should remove their headdress with their right hand and hold it at the left shoulder, the hand being over the heart. Aliens should stand at attention. The salute to the flag in a moving column should be rendered at the moment the flag passes.

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