Gunner's Mate 2nd Class Carlos Nieves demonstrates how to fire a 40mm saluting battery aboard...

Gunner's Mate 2nd Class Carlos Nieves demonstrates how to fire a 40mm saluting battery aboard USS. Constitution. USS Constitution, is the world's oldest commissioned warship afloat, and played a crucial role in the Barbary Wars and the War of 1812, actively defending sea lanes from 1797 to 1855.