Rename columbia to shuttle-columbia, to allow space for a columbia-csm if needed.
Make ov-102 a synonym of shuttle-columbia.
Merge sts-107 into shuttle-columbia without synonymizing, just to get rid of the sts-107 tag. If we find that the tag keeps getting recreated, we can revisit making it a synonym.
It's hard to judge how many questions will make use of a particular tag in the future, but I have to say I tend to agree it might be slightly too specific, and it mightn't find many future uses. However, we do have other tags that further differentiate between various artificial satellite types, be it by their purpose / function, design / size, e.t.c. and ...
I strongly disapprove of that because Columbia had a long and storied history. It should not be only known because of the accident.
There was also an Apollo command module named Columbia.
I hate it when people refer to the failures by the names of the Orbiters.
If you're going to make "columbia" = "sts-107" then we need "columbia-...
Given that the falcon-9r tag description says "variant of the SpaceX Falcon 9 rocket with reusable first and second stages" I suggest we remove it entirely, folding any misuse of it into falcon-9, since no such animal exists.
There's nothing wrong with a question having falcon-9 and falcon9-r tags, even if it's only about falcon9-r. Falcon 9R is just a special configuration of Falcon 9, so the falcon-9 tag still applies. The only reason someone should drop the more general tag is if they need the space for other tags.
That said, if someone applied falcon9-r to a question that ...
I upvoted this, but now that I've had time to think about it, I'm not entirely sure it's necessary. The tag attitude is not inappropriate on those questions, and the tag attitude-determination-and-control has enough questions on its own that it's not in need of a boost.
Obviously, it would be ideal if those questions had attitude-determination-and-control, ...
I could see us getting more questions on the Columbia orbiter. I think a merge/synonym of sts-107 into columbia would be a good idea, not because they are exactly equal, but because we don't need a separate tag for the subset of questions about specifically mission STS-107.