Three Forty Three is a Ranger 4200-class fireboat that serves the New York City Fire Department as marine company 1.

The boat's name comes from the number of FDNY members killed in the line of duty on September 11, 2001.

For days following the terrorist attack the only water available to the area was provided by the FDNY's Marine Units.

A sister vessel named Fire Fighter II was delivered and placed in service with Marine 9 in November 2010 to replace the 70-year-old Fire Fighter, which is listed on the National Register of Historic Places, and represented the city's first major investment in new fireboats in 50 years.

[3] The 140-foot (43 m), 500-ton, $27 million fast response boat is the country's largest fireboat, with a maximum speed of 18 knots (33 km/h; 21 mph).