In some countries, such as Israel and Switzerland, it is common to see people walking around with slung military rifles. No one except tourists pay much attention. The United States is split. In areas where the gun culture is entrenched and accepted (most of the land area of the U.S.) nobody pays much attention, but it is more unusual than in Switzerland. In areas where the gun culture is reviled by the local powers that be, it can land you in trouble. There are five states that ban the open carry of firearms in most public places. They are...