The new war in the Middle East is a reminder that global peace never seems to last. As tragic as these circumstances always are, it's worth considering the defense companies that provide America with the machinery and technology it uses to defend itself and its interests. Investors who are comfortable owning defense stocks could start with Lockheed Martin (NYSE: LMT) and RTX (NYSE: RTX), two prominent industry leaders worth adding to a long-term stock portfolio. Will AI create the world's first trilliona ...