USS Constitution goes underway in Boston Harbor in celebration of Independence Day, 2022. USS Constitution is the world’s oldest commissioned warship afloat. (Alec Kramer/U.S. Navy)

Want to “serve” on the world’s oldest commissioned warship still afloat? Now is your chance.

A free lottery to win a spot aboard USS Constitution’s July 4th underway demonstration opened Tuesday. The lottery will select, at random, 150 people to join the crew as they set sail in Boston Harbor. Each person selected will be allowed to bring one guest.

Passengers will be able to engage with active-duty sailors on board to learn about the Navy and the history of the USS Constitution, and they will have a front-row seat as the crew fires a 21-gun salute in honor of Independence Day.

A link to the invitation is available on the Constitution’s Facebook and Instagram pages.

The USS Constitution, known as “Old Ironsides” and America’s Ship of State, was launched in 1797 and played a crucial role in the Barbary Wars in the early 1800s, and famously in the War of 1812. It actively defended sea lanes from 1797 to 1855.

The Constitution remains both a training and ceremonial ship for the Navy, served by active-duty sailors, as well as an educational experience for visitors. The ship is open for tours Tuesday-Sunday, 10 a.m.-6 p.m.

Direct any questions about the lottery to USS Constitution’s Special Events Division at: 617-593-2025 or ussconstitution.events@gmail.com.