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In 2007, Newsnight's Mark Urban spent three days with an American unit in southern Baghdad.

It was the height of the Iraq campaign and the Gator Company in Doura had faced the fury of the insurgency for 15 months.

More than ten years later, Mark reunites with three of the soldiers he met.

This is a story about how war changes people, how it binds them, and how life afterwards is never the same.