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.
There are several questions here. First, the IRS can collect for 10 years following the assessment of any tax. It appears from your post that your soon to be husband doesn't owe any tax for 2009 - If the IRS determines there is a tax due, they will complete his tax return for him (substitute for return or SFR). A tax determined from an SFR does not have a statute of limitations, the IRS can always collect that tax.