Every day, Wall Street analysts upgrade some stocks, downgrade others, and “initiate coverage” on a few more. But do these analysts even know what they’re talking about? Today, we’re taking one high-profile Wall Street pick and putting it under the microscope…With $52 billion in annual sales and a $90 billion market capitalization, Lockheed Martin (NYSE:LMT) is a bona fide titan of American industry — and the biggest pure-play defense stock in the world. Maker of the vaunted F-35 Lightning II stealth fighter, it’s going to be America’s premier fighter-jet maker for decades to come.  more