I sold a house on Aug 2015 that I had lived in from 2003-2007. On my 2015 returns, I  claimed the capital gains exemption under IRS Publication 523 with the Service suspension as I was PCS'ed abroad from 2007-2013. I am now looking to sell my primary residence (2013-present) but would like to know when the soonest I could do so and still claim this exemption. I pass the residency test, but the look-back test verbiage has me a bit uncertain on what the 2 year window would be. Thanks.