File sharing knows no bounds in a war zone. Songs are passed from PC to PC and played on personal MP3 and CD players, or even speakers wired into military vehicles.

“People can put [iPod] nanos in their flak jackets and they are ready to go,” Pieslak tells The Post.

His biggest surprise? The musical diversity. “Civilians have a notion that members of the military are uniform in beliefs—they are all lined up in rows, wear the same clothes and have the same haircut,” Pieslak says. That uniformity might be true on a mission, but back on base, music runs wild.

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