Military currently on deployment

Members of the military serving in combat zones get an automatic 180-day extension from the IRS for filing tax returns, paying taxes and filing refund claims. The automatic extension also applies to making qualified contributions to an IRA. However, this exception does not apply to Social Security and Medicare taxes.  

In addition, if you are a U.S. citizen or resident alien residing overseas, or are in the military on duty outside the U.S., on the regular due date of your return, you are allowed an automatic 2-month extension to file your return without requesting an extension. 

Here's some general information: Serving Uncle Sam: Tax Breaks for the Military.