Lockheed Martin (NYSE:LMT) is downgraded to Underperform at RBC, ahead of a possible cut to its...

Lockheed Martin (NYSE:LMT) is downgraded to Underperform at RBC, ahead of a possible cut to its troubled F-35 Joint Strike Fighter program. RBC sees 2012 as a challenging year for the defense sector, with a reduced Defense Department budget plus "persistent uncertainty as to what exactly the cuts will be, and when they will occur." LMT -1.2% premarket.