NATO: Organization, mission and members

NATO is an alliance of 30 member states, each with a pledge to protect other members if attacked.

Flag of NATO
(Image credit: Getty / Jeff Overs)
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Marc Lallanilla
Live Science Contributor
Marc Lallanilla has been a science writer and health editor at About.com and a producer with ABCNews.com. His freelance writing has appeared in the Los Angeles Times and TheWeek.com. Marc has a Master's degree in environmental planning from the University of California, Berkeley, and an undergraduate degree from the University of Texas at Austin.
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