Another article I read said they did this in ‘11 and ‘12 too
They said they did it to remind/inform especially young golfers about the events of 9-11.
I watched a documentary about Australian exploitation films (not quite drive-in movies).
In one, a news report came out about the lead actress in some film being horrified when she learned that she'd be taking her top of in a film that was in production.
The director promptly called her and said he didn't know there was a problem. She said that there wasn't, that she was just helping to generate some publicity.