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.
1 Records for tax deductions taken-the IRS has six years to challenge your return if it thinks you under-reported your gross income by 25 percent or more; there is no time limit if you failed to file your return or filed a fraudulent return.