A photo of a former staff sergeant who lost his legs in Afghanistan being carried on his wife’s back has gone viral on Facebook — here is the story behind the picture. Former Marine Staff Sgt. Jesse Cottle told KTVB in Idaho that he joined the Corps in 2003. The explosive ordinance disposal Marine was on a foot patrol in Afghanistan in 2009 when he stepped on a pressure plate that triggered a blast. Cottle was left a double amputee, having lost his legs after struck by an anti-personnel improvised explosive device. The explosion was caught on camera, KTVB reported,…