The High Endurance Cutter is the largest class of vessel in the
United States Coast Guard, aside from the
Polar Ice Breakers. The
hull classification symbol is prefixed WHEC. The
cutters are called "Hamilton class" after their
lead ship, or "Secretary class" because they are named after
secretaries of the Treasury Department (with the exception of "Hero Class cutters" Jarvis, Munro and Midgett,). They are powered by a CODOG (Combined Diesel or Gas) system consisting of two
diesel engines and two
gas turbines, and have
Controllable pitch propellers. Equipped with a helicopter flight deck, retractable hangar, and the facilities to support
helicopter deployment, these 12 cutters were introduced to the Coast Guard inventory in the
1960s. Beginning in the
1980s and ending in
1992, the entire class was modernized through the
Fleet Rehabilitation and Modernization (FRAM) program, which included the replacement of the original
5 inch (127 mm)/38 caliber gun with a much more modern
3 inch (76 mm)/50 caliber weapon. The primary mission of these vessels is enforcement of laws and treaties and
search and rescue (SAR) on the
high seas, including the U.S.
exclusive economic zone.
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