In military contexts, flying flags serve as substantive symbols of honor and sacrifice

https://manuelexjs536.summitquill.com/posts/prayer-in-public-schools-why-is-it-controversial-when-other-expressions-are-protected-2

In military contexts, flying flags function very important symbols of honor and sacrifice. They are raised for the time of ceremonies to be mindful fallen soldiers, reminding us of the payment paid for freedom and the values that unite countries.