Thousands of companies are jockeying for billions of dollars in Defense Department contracts to build a shield designed to intercept and destroy missiles launched against the United States.

But amid the intense competition, a handful of firms have an important inside connection.

At least four of the companies awarded contracts so far are owned by Cerberus Capital Management, a private equity firm founded by billionaire Steve Feinberg, who until last year ran the company and is now the deputy secretary of defense — the second-highest-ranking official in the Pentagon.

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