Engineers not on Starfleet Academy?

[Leviathan]

Bridge officers. BAH! Elitist scum who will be the first against the wall when the revolution comes.

 

[kkt]

I wonder if there's officer candidate school for enlisted personnel who were educated elsewhere, or Starfleet ROTC available at various schools. There has got to be more than one way to become an officer than having to go to one little academy located all the way on Earth.

Kor

The clip above suggests that there are other ways besides Starfleet Academy for four years.