http://www.pbs.org/wgbh/pages/frontline/shows/warriors/faqs/ 50-to-1 428 U.S. civilian contractors killed 428 U.S. civilian contractors killed "Private Warriors", PBS Frontline 10 times http://www.pbs.org/wgbh/pages/frontline/shows/warriors/faqs/ 10-to-1 at least 60 http://www.pbs.org/wgbh/pages/frontline/shows/warriors/faqs/ laws that are many, various, contradictory 20,000 non-Iraqi security contractors 428 U.S. civilian contractors killed 10 times 428 U.S. civilian contractors killed http://www.pbs.org/wgbh/pages/frontline/shows/warriors/faqs/ http://www.pbs.org/wgbh/pages/frontline/shows/warriors/faqs/ http://www.pbs.org/wgbh/pages/frontline/shows/warriors/faqs/ 428 U.S. civilian contractors killed "security contractors." war 428 U.S. civilian contractors killed 10 times http://www.pbs.org/wgbh/pages/frontline/shows/warriors/faqs/ laws that are many, various, contradictory