In the weeks following the San Bernardino massacre, several Sheriff's and Police Chiefs have called for people who can legally carry arms to carry them for increased security of themselves and others. Law officers as diverse as Detroit Police Chief James Craig of Detroit and Sheriff Joe Arpaio of Maricopa County in Arizona have asked people who can legally carry firearms to carry at all times that they are out and about. Now Sheriff Helmig of Ohio has added his name to the growing list. The concept is not new. It is as old as mankind and has been...