That's not true at all. My local Post master was never any of those-but she was the non-union Saturday part-time employee that ran the local Post Office on Saturday mornings and when the regular Post Master went on vacation. Now, get the picture here: she's 67 and doesnt even have enough time in to draw a pension-because she was part-time for many years. I guess you could call that 'hiring from the inside' . .do you have a better plan?