This is the high school of one of the falsely accused Duke lacrosse players. Fifty-five sounds like a lot. Chaminade must be (or at least was in the past) encouraging love of country.
Did you know it is a Catholic school with an enrollment of about 1700? With serious sports teams, too!
It's a big school and if it's been around for a while, that 55 could cover many generations. I would not be at all surprised if the High School I went to had 55 or more, although I don't know if they ever kept track like this school does. The school has been there since the Spanish-American War and had well over 2500 students when I attended. I know of two classmates that died in Vietnam and there could have been more than that for all I know.