The defense giant said the decrease in earnings was driven by reduced profit and mark-to-market losses from 'changes in the fair value of investments and liabilities for deferred compensation plans'. The company retained its full-year outlook shared in January. Lockheed Martin Corporation (NYSE:LMT) is one of the world's largest defense contractors. It specializes in the research, design, and development of advanced technology systems, products, and services. It is famed for manufacturing notable fighter je ...