The article discusses the mystery of the fire helmet behind Frank Reagan's desk in the TV show Blue Bloods. While no official explanation has been given, fans have speculated on its significance. One theory is that the FDNY sent it as a goodwill gesture when Frank became Commissioner. Another theory suggests that it could serve as Frank's private 9/11 memorial or honor a fallen friend in the NYFD. However, these theories are not canon, and the true explanation remains unknown.
