I find it absolutely inconceivable that anyone would think that this is a stepping stone to something better. I mean, yes... you kind of expect it if you're running a bar in a big University town that a fair proportion of your employees are going to be with you, at very best 3 years... but Air Traffic Control? Who would even entertain the idea of doing it for just a bit?!!
(OK, so I don't speak with the benefit of experience. That's just my view from the bottom, FWIW).