National Guard to Fire Cannon on Boston Common Today

People portraying Civil War soldiers from the South fire a cannon during Civil War Days at Naper Settlement in Naperville, Illinois, May 17, 2014. Participants dress in period costumes to recreate a battle scene from the war that took place in the United States from 1861-1865. Picture taken May 17, 2014. REUTERS/Jim Young (UNITED STATES - Tags: CONFLICT SOCIETY ANNIVERSARY)
A cannon being fired during a Civil War reenactment in Illinois.

If you hear a loud bang this afternoon, don’t worry. It’s supposed to happen.

The National Guard will be holding a cannon and artillery salute, including the firing of ceremonial cannons, on the Boston Common between 12:30 and 1 p.m. today.

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The ceremony is part of a June Day celebration held by the Ancient and Honorable Artillery Company of Massachusetts. According to a release on the Massachusetts National Guard’s Facebook page, the organization convenes on the first Monday every June to elect new officers and sergeants during a reenactment of their first election, held in 1638. The ceremonial gathering on the Common has been held uninterrupted in every year since then.