U.S. forces are using two types of tomahawks in Iraq: one, a high-tech cruise missile — the other, a bit more like the hatchet Mel Gibson used in the movie The Patriot. Members of Air Force security groups, Army Rangers and special forces are some of the U.S. troops who have chosen to add tomahawks to their basic gear. So why would a member of today's armed services want a relic of the American frontier? According to one modern tomahawk manufacturer, it comes down to science, and the reasons soldiers carried them in the Revolutionary War are still valid today....