Ubiquitous orange and white taxis line up in front of a mosque in Kirkuk Iraq. Photographer Russell Klika explained how servicemen and women viewed the taxis.

"Taxis were everywhere in the city, but they made soldiers nervous because you never knew what they were carrying. Their fares might be just people going about their business, or it could be carrying the explosive device that would end your life."

Photo by U.S. Army Staff Sgt. Russell Klika