Glad to see you did your research! While AR 670-1 does specifically state it is your choice, there is an ALARACT message that may be the source of confusion. Please see the file I’ve attached to the bottom of this post.
Let’s say you are absolutely 100% correct. Are you sure you want to become the martyr for this issue within your Brigade? This may be one of those issues where it is smart to pick your battles. It appears your command is not going to be receptive to a change. I would encourage you not to fight this battle as the last stand, as I do not see any benefit to it. Sometimes in the service it is just better to shut up and color.