American soldiers are committing suicide in the greatest numbers since official records began in 1980, with the US Army at a loss to explain the phenomenon since a third of the dead have never been deployed in combat. Suicides in the army alone have passed last year's record of 140 - 141 in 2009 so far. The upward trend has defied efforts to improve access to appropriate counselling for veterans returning from combat tours in Iraq and Afghanistan. The figure for the first ten months of the year excludes 71 suicides among troops taken off active duty in 2009, and 42 in the US Marine Corps. Roughly a third of this year's suicides have been by soldiers taking their own lives in war zones, a third by returning soldiers and a third by those based permanently in the US or awaiting deployment overseas. Many military suicides can be traced in part to an inability to process the guilt of having killed in battle.