Another reason why you would need to have more than one passport is if you are a U.S. diplomat or are an active duty military personnel. These jobs require government-ordered business passports which are different than a passport used for leisure.
Government workers are only allowed to use their government-issued passport on work-related trips. They need to have a standard passport for all personal travel.
https://www.passporthealthusa.com/pa...od%20of%20time.
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