I recently switched jobs from the private sector to a very similar paying job with a public agency. The other day we had an optional meeting to talk to a rep about a 457b plan, which my HR rep described as basically a 401k.
After doing a little bit of research and going to the meeting, I realized that a 457b is about as mustachian as it gets and I accidentally walked into a jackpot! If you aren't familiar, it is a pre-tax plan that has no penalties for withdrawal after you leave service. Withdrawal is taxed like normal income, but I think I'm not unique on these boards in saying that I will likely withdraw in about 2 brackets lower than my current income tax.
All this being said, I think that you sort of have to be in the right place to take advantage of these plans. But if you are considering a government job, do some research on the governmental 457b!