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But the short and soft-spoken specialist is at the center of a legal controversy. He has filed a lawsuit alleging that he's been harassed and his constitutional rights have been violated because he doesn't believe in God. The suit names Defense Secretary Robert Gates.

Known as "the atheist guy," Hall has been called immoral, a devil worshipper and -- just as severe to some soldiers -- gay, none of which, he says, is true. Hall even drove fellow soldiers to church in Iraq and paused while they prayed before meals.

It wasn't until he joined the Army that he began questioning religion, eventually deciding that he couldn't follow any faith.

It eventually came out in Iraq in 2007, when he was in a firefight. Hall was a gunner on a Humvee, which took several bullets in its protective shield. Afterward, his commander asked whether he believed in God, Hall said.

"I said, 'No, but I believe in Plexiglas,' " Hall said.