Hundreds of thousands of people become US citizens every year. But only a few of them get naturalized on October 31st...and get to take the oath of citizenship in their Halloween costumes.

Dressed in Halloween costumes, 39 children welcomed as US citizens in special @USCIS ceremony outside Baltimore. pic.twitter.com/Ov0MFka7pM — M. Scott Mahaskey (@smahaskey) October 31, 2014

CORRECTION: This post originally said that children becoming US citizens have to pass the standard citizenship test. In fact, if a parent becomes a US citizen through the standard process (including a citizenship test), the child becomes eligible for citizenship without having to go through the full process. We apologize for the error.