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.
Tax law says a taxpayer has three years to file a return and get the associated refund. Since the 2011 tax year returns were due by the April 2012 deadline, that three-year window allows these forms to be filed by the April 2015 filing due date. The time-shift tax filing is not unusual.