"Most of us think a U.S. passport is the "gold standard" of proof of American citizenship. Think again. All three "flavors" of American citizens -- native-born, naturalized and those born abroad -- may apply for U.S. passports, but only native-born Americans may use their passports to prove their citizenship when enlisting in the Army National Guard. If you are a naturalized or foreign-born American, your shiny, blue U.S. passport won't mean squat to the Guard." - Daniel M. Kowalski, Aug. 7, 2014.