In the last six months, Lockheed Martin has announced acquisition after acquisition, adding nearly a half-dozen companies to its business. But not one has been a company of significant size. The government contracting market is bracing for reshaping and consolidation, expecting that reduced Pentagon budgets will mean changes for the defense industry. So far, however, the major players have shown little interest in making big deals, instead finding small, niche companies the most attractive targets. Lockheed has led the charge,...