Thanks to IRS.gov : Additionally, there are new benefits for members of the military and certain other federal employees: • Members of the military and certain other federal employees serving outside the U.S. have an extra year to buy a principal residence in the U.S. and qualify for the credit. … It applies to any individual (and, if married, the individual’s spouse) who serves on qualified official extended duty service outside of the United States for at least 90 days during the period beginning after Dec. 31, 2008, and ending before May 1, 2010. … This relief applies where a home is sold or stops being the taxpayer’s principal residence after Dec. 31, 2008, in connection with government orders received by the individual (or the individual’s spouse) for qualified official extended duty service. … Qualified official extended duty is any period of extended duty while serving at a place of duty at least 50 miles away from the taxpayer’s principal residence (whether inside or outside the U.S.) or while residing under government orders in government quarters.