Why Is Everyone Ignoring Lockheed Martin Stock's High Cash Yield?

Lockheed Martin (LMT) generated free cash flow equal to 6.9% of its market value over the last twelve months, compared with 4.4% for the median S&P 500 company. That cash belongs to shareholders whether the company pays it out or not. A yield this high marks either a business on sale or one the market expects to shrink. So why do buyers pay so little for Lockheed's cash.