They are riding to corral the epidemic of veteran suicides. More than a dozen former military members are saddling up for a 20-mile trip on horseback through the streets of Manhattan Saturday as part of an effort to raise awareness of the tragic issue. The seventh-annual Trail to Zero ride – organized by equine therapy nonprofit BraveHearts – will see veterans and their steeds trot from Ground Zero to Times Square and Central Park before returning south again to One World Trade Center. For some