Okay, you are, per your own description, insane, but let me explain how it actually works.
Only leaders can set announcements. This is a set-in-stone game mechanic. They do this by placing "/a" in front of what they want the announcement to be. You know, kinda like officer comms. I repeat, ONLY leaders can do this. No one else.
Side note, this makes me wonder if you live in Washington or Colorado.