So it's the cutters and bases that are the first line in search & rescue, aid to ships, and law enforcement. The breakers are more for planned operations, scientific support and of course ice breaking.
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With such a sturdy hull and high power to back it up, the 13,000-ton(13,200-metric ton) Polar Star is able to ram her way through ice up to 21 feet (6.4 meters) thick and steam continuously through 6 feet (1.8 meters) of ice at 3 knots (5.6 kph).
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Shazzam! 
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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