By CBS3 Staff

PHILADELPHIA (CBS) — Tuesday, June 14 is Flag Day. A naturalization ceremony was held in celebration of Flag Day.

Thirteen people from around the world were sworn in as American citizens Tuesday at the National Constitution Center. The naturalization ceremony was supposed to take place in the courtyard of the Betsy Ross House, but it was moved inside due to rain.

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During the ceremony, visitors also met members of the defense logistics agency, they make the flags here in Philadelphia.

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Pennsylvania is the only state that recognizes Flag Day as a legal holiday.