In all, 404 of the fatalities are classed as killed "as a result of hostile action" and 51 are known to have died either as a result of illness, non-combat injuries or accidents, or have not yet officially been assigned a cause of death pending the outcome of an investigation. The Army has seen the heaviest losses, with 362 fatalities as of 1 May 2013. Typically those killed were aged between 20 and 29 and the biggest losses seen in 2009 and 2010. Of those killed, 439 were male and three were female.