This guy works for Blackwater, a firm that does 'work' for the U.S. government. By all means, it is fair to sum up their job as being mercinaries. 'Civilian contractors' as they are often referred, many of those who do work for Blackwater are ex-Navy SEALS. It pretty much goes without saying that these motherfuckers are ELITE. At one point this guy sniping people is engaging so many targets that he says "this is like a fucking turkey shoot".
http://www.combatvids.com/vidshow.php?vurl=Najaf_cut.wmv