They take 16 turns to charge up. So if you are not seeing the operation available yet, they apparently have not been built more than 16 turns ago. Otherwise, once they eventually show up, you use them exactly the same like any other operation. Ah! Thanks. Obvious when you know. 8) I had assumed the...

I've created a few in my Cities but they never show up in Operations and I've obviously never been able to use one because I don't know how
What am I missing?

Apologies if the answer is obvious but I can't find an answer anywhere.