There is no available information in the search results about a US nonprofit organization named "New Horizons Missions" with the EIN 473186432. Therefore, it is not possible to write an article based on the provided query.

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[1] https://www.thenewhorizonsfoundation.com [2] https://newhorizonsls.org [3] https://www.new-horizons.org/missio.html [4] https://newhorizonsfoundation.com [5] https://nhbh.org/welcome-mission