If you work for the post office, you're a civil servant. The Civil Rights movement focused on the notion that all American citizens were entitled to the same basic civil liberties.
There is also time limit to consider for sending the amended returns, and it is generally three years from the time you filed the returns or two years after the tax payment (whichever is later). If you plan to amend more than one tax return, you have to file separate 1040X for every one you want to change.
Generally, the statute of limitations for the IRS to. taxes on a taxpayer expires three (3) years from the due date of the return or the date on which it was filed, whichever is later. A return is considered to be filed on the due date of the return if it was filed on or before its due date.