A Fairfield family says a U.S. Army sergeant saved the day when he chased down and tackled a man who was trying to steal a motorcycle from their shed.The Masons say their daughter's fiance, a sergeant in special operations forces, was just following his training when he jumped in and stopped the crime. Police say three people pursued the suspect through the neighborhood until a neighbor heard all of the commotion and called 911. Police are not identifying the suspect because he is a minor, but they say he will face charges.