User blog comment:Gruntburner/Mass Effect 3 Achievements Revealed/@comment-4118072-20120204224838/@comment-1900300-20120208135132

Well the Illusive Man is a possiblity as he was has appeared in past games. Or even Harbinger. But TIM (Jack Harper) was never identified as an N7 marine. He was a mercenary during the First Contact War and retired from service soon after