Whichever firefighter ends up with the most "likes" by July 31 will be the new cover girl.
Everyone who votes will be entered in a drawing to win one of 10 calendars, and two lucky grand prize winners will have their calendar personally delivered to them if they live in New Zealand.
For every $10 calendar sold, $1 is given to The Child Cancer Foundation, while all other proceeds go to the firefighters to help them travel to and compete in the World Firefighter Games & Challenges.
Since the annual calendar was started 22 years ago, $640,000 have been raised.
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