[drbuzzard]

As I said, the USPS is not a federal agency. It is independent and self funded. As such, it is correct to exclude it from that sort of analysis.

[muawiyah]

No, the United States Postal Service is quite federal. It is called an Independent Executive Establishment. That's because its budget is not part of the federal budget.

The employees retire on federal retirement. They are subject to all the ethical laws affecting all federal employees.