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.
Individuals can file an amended return using Form 1040X. To receive a credit or refund, taxpayers must file their amended return within three years of the date their original return was due -- usually April 15 -- or within two years of the date they paid the tax due on the return, whichever is later.