HERE’S a window into a tragedy within the American military: For every soldier killed on the battlefield this year, about 25 veterans are dying by their own hands. An American soldier dies every day and a half, on average, in Iraq or Afghanistan. Veterans kill themselves at a rate of one every 80 minutes. More than 6,500 veteran suicides are logged every year — more than the total number of soldiers killed in Afghanistan and Iraq combined since those wars began. These unnoticed killing fields are places like New Middletown, Ohio, where Cheryl DeBow raised two sons, Michael and Ryan...