He's white. He's in the Iraqi desert in high Summer. He's wearing a Winter ski mask on his head, but he's got it pulled up for the moment to get a better view (probably surprised by an Apache hovering nearby). Good money says that he drew that mask down moments after that photo was snapped to protect his foreign identity. Notice that he has "soft" skin, not a Sun-hardened desert complexion. He's also got a clean sniper rifle with clean optics, a trick in and of itself in dusty Iraq.
Add it all up and there is a pretty overwhelming chance that he is an imported Chechen mercenary sniper...though he could be an Irish import (IRA freelancer).
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