There are three national holidays, including ceremonies involving a 21-gun salute at noon, which receive special remembrance by the u. s. navy. these three holidays are

George Washington's Birthday, Independence Day and Memorial Day.

Explanation:

A 21-gun salute is a customary gun salute to honor military casualties that is performed by firing 21 rounds into the air, usually shot by soldiers with rifles but in very few cases are shot with cannons or heavy artillery. According to my research on the different United States national holidays , I can say that based on the information provided within the question the holidays being described are George Washington's Birthday, Independence Day and Memorial Day.

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