Key PointsLockheed Martin stock dipped last Thursday and at the start of the week, extending a multi-month decline.An interim peace deal in Iran is the primary culprit.That feels unfair because the stock also slumped during the war.10 stocks we like better than Lockheed Martin › It's often said that financial markets are efficient. However, Mr. Market doesn't bat 1.000, and he's not always just. Take the case of Lockheed Martin (NYSE: LMT). The …