Sign of the apocalypse? America's Cup yachtsmen now wear helmets

Skipper Jimmy Spithill and his mates aboard Oracle Team USA are on the brink of finishing one of the greatest comebacks in sports history. An America's Cup that had the look of an embarrassing loss comes down to a winner-take-all race Wednesday. And the Yachtsmen will do it wearing helmets.

Crew memebers on Oracle Team USA celebrate after crossing the finish line during the 18th race of the America's Cup sailing event against Emirates Team New Zealand, Tuesday, Sept. 24, 2013, in San Francisco. Oracle Team USA won races 17 adn 18 to pull even with Emirates Team New Zealand. (AP Photo/Ben Margot)

Crew memebers on Oracle Team USA celebrate after crossing the finish line during the 18th race of the America's Cup sailing event against Emirates Team New Zealand, Tuesday, Sept. 24, 2013, in San Francisco. Oracle Team USA won races 17 adn 18 to pull even with Emirates Team New Zealand. (AP Photo/Ben Margot)

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