"CASTLE ROCK, Cowlitz County -- For Army veteran Alex Seling, his ailing right knee has been the weak link on a slow trek from the Mexico border to Canada that began last spring. The pain never entirely goes away, sometimes slowing his gait to a limp, or compelling him to rest for a few days before resuming his hike north.
This is not some old war wound. It's self-inflicted. Depression mixed with rage led him last winter to slam his leg into a vacuum cleaner in his Los Angeles apartment.
His swollen knee turned red and purple, and thrust Seling into a dark place. He felt his life lacked the purpose, passion and camaraderie experienced during a 2008 tour as a combat medic in Iraq, and he thought of suicide."