Lockheed Martin's (LMT -8.69%) quarter was loaded with cost overruns and write-offs, causing the defense contractor to miss expectations.Investors were disappointed, sending Lockheed shares down more than 5% as of 10:30 ET Tuesday. Charges eat into resultsLockheed Martin ranks as the world's largest defense contractor, but the company has come on hard times of late. The maker of the F-35 and a wide range of helicopters, missiles, and space systems has been shut out of recent high-profile awards, including t ...