A brave dog who saved the lives of American troops in Afghanistan and was flown to live in America was accidentally euthanized by an Arizona animal shelter employee yesterday.  Target, a female shepherd mix, made headlines earlier this year when she chased away a suicide bomber in Afghanistan who attempted to target a military base containing almost 50 soldiers. The troops befriended Target and two other strays. Target and another stray, Rufus, were eventually flown from Afghanistan to Arizona to be reunited with Sgt. Terry Young, who adopted the canine duo.