"Mandatory Volunteering" in San Jose School District

Huh?

"District may require parents to volunteer" is the title of the article today (paper version) by Sharon Noguchi at San Jose Mercury News.

The online version of the article has a different headline, which is even more hilarious: "School district may make volunteering mandatory"

Maybe I'm missing some intricacy of the English language, but isn't volunteering supposed to be, uh, how to say it, voluntary?

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