They show up occasionally on your sector missions, but if they don't, try checking your Doff's Operation missions. It'll likely be there as well.
One thing though, when you pick up this mission, there's a hidden 28 hour cooldown to get this mission again. And failing getting this mission, they can be found on the exchange, for a price of EC.
Was named Trek17, but still an author.
Been playing STO since Open Beta, and have never regarded anything as worse than 'meh'. I have nothing against the game/devs, nor any particular wish to talk bad about either, or praise most decisions. Still, it's better to be positive than cynical.