Patrick Shanahan -- a onetime Boeing engineer who spent the last two years at the Pentagon -- seemed set to lead the world's most powerful military, until a history of violent incidents in his family derailed his plans. It was a surprising end to Shanahan's quick rise to the top spot at the Department of Defense in just two years. At issue are two incidents: a 2010 altercation between Shanahan and his then-wife Kimberley at their home in Seattle that left him with a bloody nose and her in custody -- amid claims that he also hit her.