Soldiers returning from Iraq and Afghanistan are a generation of warriors whose fight has shifted from external combat zones to invisible internal battlefields.
At 8:20 p.m. on Sept. 21, 2010, Iraq veteran Brock Savelkoul decided it was time to die. He lurched from his black Tacoma pickup truck, gripping a 9-mm pistol. In front of him, a half dozen law enforcement officers crouched behind patrol cars with their weapons drawn. They had surrounded him on a muddy red road after an hour-long chase that reached speeds of 105 miles per hour.
As it happened, Savelkoul's state of mind was of interest not only to the cops, but to some of the nation's top military officers and medical researchers.