Can a 16 year old get a passport without a parent?

Question: My 16 year old son has an expired passport ( exp. 3/ 15/ 2011.) My husband and I are in Tonga at the moment so we sent him back to the US before

Source: http://www.us-passport-service-guide.com/can-a-16-year-old-get-a-passport-without-a-parent.html

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