If you have purchased a Legacy or Starter Pack, please see this thread for instructions on how to claim your items in-game. (Please see the yellow text in the linked thread for instructions on creating a Reman.) (Not seeing your pack in-game? Please see the lime-green text in the linked thread above for information.)
If you have additional questions about the Legacy or Starter pack, please read this FAQ.
Thanks SO MUCH for all your support, and we'll see you in-game!
You really only get 2 class-specific skills per rank -- 1 space and 1 ground. For example, the rank 1 Tactical space skill is Attack Pattern Alpha.
Other than that, at least as far as space is concerned, Tacticals, Engineers and Scientists are identical. (For GROUND combat there are big differences but for space, a Tactical and an Engineer will only differ by 1 skill per rank.)
So, tactical officer in a cruiser? Sure, why not.
The argument could be made that you should maximize your abilities, though. Attack Pattern Alpha gives you a damage buff, so the more damage you have TO buff, the more helpful it will be. With that in mind, you'd want to be in the highest DPS ship there is: an Escort.
Similarly, Engineers get Rotate Shield Frequencies, so you'd think it would make sense for them to be in the ship that gets the biggest shield bonus, which is Cruisers.
But if you tend to like hybrids, then a Tactical in a Cruiser would be giving up some DPS for some survivability. He'll still DPS better than an engineer in a Cruiser, but he won't tank quite as well.