Can I renew my passport without sending in the old one because I need it for travel

Question: I travel quite often with different organizations such as Operation Smile and Lifeworks International. Normally at least once a month, my passport

Source: http://www.us-passport-service-guide.com/can-i-renew-my-passport-without-sending-in-the-old-one-because-i-need-it-for-travel.html

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