I managed to get a Vulcan with TS3 from the BOff recruitment DOff assignment.
Fairly rare though, the Jem'Hadar mission reward is probably the easiest way.
"But in-game I have another name. You must learn to know me by that name. This was the very reason you were brought into the forums, that by knowing me here for a little, you might know me better there."
Apparently you can also get someone to train your Boff for you. Though, not sure how its done.
"The world ain't all sunshine and rainbows. It's a very mean and nasty place and I don't care how tough you are it will beat you to your knees and keep you there permanently if you let it. You, me, or nobody is gonna hit as hard as life. But it ain't about how hard ya hit. It's about how hard you can get hit and keep moving forward." - Rocky Balboa (2006)
that jemmie boff you get as a mission reward has it.
use that to get the training.
If you like the RPG trinity, then you hate MMOs, you hate working, competitive fair PvP, you hate balanced engaging solo content,
and, you hate PvE "adventure zones". because the trinity is incompatible with any of these.