By CBSBoston.com Staff

BOSTON (CBS) — U.S.S. Constitution honored Memorial Day with a 21-gun salute. Old Ironsides fired off at noon Monday.

The ship also hosted a ceremony on board commemorating the sailors and Marines who have died in service. Several Gold Star families were in attendance.

READ MORE: Vigil Planned For 17-Year-Old Who Drowned At Dedham Graduation Party

Navy regulations call for ships with a saluting battery to fire gun salutes starting at noon on the holiday. The ship’s flag flew at half-staff in the morning before being raised to full height after the salute.

READ MORE: Chipmunk Wanted For 'Burglarizing' Pelham NH Police Department

The event was livestreamed on Facebook. The U.S.S. Constitution will also be open Monday for public tours.

Earlier this month U.S.S. Constitution cruised Boston Harbor and fired the cannons for its first underway in more than a year.

MORE NEWS: Police: Woburn Man Who Just Received License To Carry Accidentally Shoots Friend While Showing New Gun

U.S.S. Constitution is the oldest commissioned warship afloat.

CBSBoston.com Staff