A similar question was asked here: Should the tag be air-traffic-control or atc (and other abbreviations)?
I agree that the tags should not use acronyms because there are WAY too many of them, and it makes it much harder for new people to understand the tags/questions.
That being said, federal-aviation-administration, federal-aviation-regulations, aeronautical-information-manual and others are too long for the current tag system (limited to 25 characters).
I would very much like to see some consistency when it comes to these abbreviations, and not just say "don't use it because it won't fit, but use it everywhere else".
Any suggestions?