Foreign Income
My client works as a medic in Iraq. He is paid cash money. He lives in the office he works out of. How does he file his taxes?
My client works as a medic in Iraq. He is paid cash money. He lives in the office he works out of. How does he file his taxes?

Not enough information there to give a definite answer; but read the instructions for Form 2555 to see if he qualifies for the Foreign Earned Income Exclusion, which would likely wipe out all his US tax.
That is correct, Form 2555 is used to report FEI. But there is some more info that need to be disclose to determine how he/she is to be classified.