Originally posted by: corellian77
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"...so don't just dream about flying for the Academy, make it come true. You can find a career in space: exploration, starfleet, or merchant service. Choose from navigation, engineering, space medicine, contact liaison, and more. If you have the right stuff to take on the universe, and standardized examination scores that meet requirements, dispatch your application to:
Screening Office
C/O the Commandant
Imperial Space Academy, [your sector]
and join the ranks of the proud."
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So it would appear the Academy is definitely affiliated with the Empire, however joining and graduating from it wouldn't necessarily mean you had to join the Empire and became a TIE pilot. The career choices, as you can see above, were numerous.
That's it exactly. Also, if you remember, the people Luke hangs out with (Camie, Fixer, Windy, Deke) make fun of him and Biggs for joining (or wanting to, in Luke's case) as well as expressing some concern over being made to join combat forces once they've enrolled in the academy.
In fact, that's a big portion of the first chapter of the radio version. It’s also one of my favorite parts because you really get to see the interaction between Luke and the others. They aren’t particularly nice to him and he’s more of an outsider. You get the feeling he hangs out with them because Tatooine is so sparsely populated – not because they are all close friends. They aren’t really.
It's no different than our own military. The recruiting commercials always put a spin on it to make it seem like you're training for a career in electronics, communications, or flight mechanics - downplaying the fact that you're going into combat. Plenty of people don't join our military because they have the same concerns Fixer has - they doubt the promises of a better career in civilian life.