Stand Up for the King (Part 2)
I found this interesting.
They do this in Thai cinemas, play the King's Anthem.
With some movies, it would seem to cheapen the National Anthem if it were shown beforehand. It just seems to me that the National Anthem is something to be respected for serious occasions or for those where there is a longstanding tradition of playing it.
A military base would be different and there also seems to be a long history of doing this-- playing the National Anthem-- before movies.